Observe · Regulate · Protect — since 2007. 19th OIMAP General Assembly: Singapore, 10–12 June 2026. Programme
Protection

Border controls

How customs spot and stop illicit cultural property: risk analysis, documents, indicators, seizures and follow-up.

Updated : October 28, 2026· 4 min read

Spotting the object that has no business passing

Coronation of the Virgin, Christoffel Jegher (1632–36)
Coronation of the Virgin, Christoffel Jegher (1632–36)

An effective control of cultural property does not rest on systematically opening every parcel, but on risk analysis: routes, consignors, descriptions of goods, declared values. The officer is then trained to spot the signs that justify a check.

This page presents the method recommended by the WCO and OIMAP: target, check, seize, keep, report. It is aimed at customs officers but also of interest to freight forwarders and operators.

It also explains what operators can do to make legitimate controls easier.

  • Borders
  • Control
  • Seizure

Border controls in figures

1,140Cases reported in 2024
310Cases confirmed
+22%Seizures compared with 2023
×2Use of the BIOP at borders in two years

Source: OIMAP Heritage Protection Department.

Breakdown

Airports34%
Ports26%
Land border posts22%
Mail and express18%

Places where cases were detected.

Targeting through risk analysis

Risk analysis combines several indicators: known countries of origin or transit, vague description ("decorative objects"), declared value far below the likely real value, consignor or consignee already flagged, unusual route, heavy protective packaging.

Customs systems make it possible to code these criteria and automatically flag the consignments to check. OIMAP analysts help to refine them on the basis of trends in the BIOP database.

Ships near the Trieux River, Paul Signac (1925)
Ships near the Trieux River, Paul Signac (1925)
Nuova pianta di Roma data in luce da Giambattista Nolli l’anno MDCCXLVII, known as La Pianta Grande di Roma, Giovanni Battista Nolli (1748)
Nuova pianta di Roma data in luce da Giambattista Nolli l’anno MDCCXLVII, known as La Pianta Grande di Roma, Giovanni Battista Nolli (1748)
Whitby Harbor, Frank Meadow Sutcliffe (c. 1885)
Whitby Harbor, Frank Meadow Sutcliffe (c. 1885)

Checking on the spot

Faced with a suspect consignment, the officer consults the documents (invoice, export licence, certificate), compares the object with the identification sheets, photographs the distinctive features and queries the BIOP database. In case of doubt, they can contact the BIOP unit and receive an expert opinion within hours.

If the object is suspect, it is sealed, with a report. Fragile or delicate objects must be handled according to OIMAP's instructions to avoid irreparable damage.

Seizure, conservation, follow-up

Seized objects are kept in appropriate security and conservation conditions. An appraisal is requested, if need be, from OIMAP or an accredited expert. The file is passed to the courts and, if the origin is established, to the State of provenance for restitution.

Good-faith operators whose consignment was wrongly held are informed of their remedies. They can obtain release of the property as soon as its documents are validated, and a prompt review is guaranteed.

Training freight forwarders

Freight forwarders and carriers are important partners for customs. OIMAP offers awareness sessions on cultural property, required documents and warning signs. More than six hundred transport professionals have benefited.

These training sessions change practices: forwarders more systematically ask for licences and OIMAP numbers, and more readily refuse consignments whose documents are doubtful.

Documents to check

Five documents
DocumentWhat it provesAlert if
InvoicePrice and sellerVague description, abnormal price
Export licenceAuthorisation to leaveMissing or unverifiable
OIMAP certificateAuthenticity and provenanceNon-existent number
Customs declarationNature and valueUnder-declared value
Packing listContents of the parcelInconsistencies with the invoice

Landmarks

  1. Risk analysis

    Targeting of the consignment.

  2. Verification

    Documents and object.

  3. BIOP consultation

    Search.

  4. Decision

    Release or seizure.

  5. Follow-up

    Appraisal, courts.

A well-prepared check is quick

The Dance at the Court of Herod, Israhel van Meckenem (c. 1500)
The Dance at the Court of Herod, Israhel van Meckenem (c. 1500)
S. Giorgio Maggiore, Michele Marieschi (1741)
S. Giorgio Maggiore, Michele Marieschi (1741)
Dune Scene with Peasant Figures, Willem van de Velde (mid-1650s)
Dune Scene with Peasant Figures, Willem van de Velde (mid-1650s)

Documentary or physical check

Return of the Fishing Boats at Collioure, near the Spanish Border, Adolphe Appian (1878)

Documentary

Examination of documents
  • Quick
  • Does not touch the object
  • Insufficient for doubtful cases

First level.

Portrait of John VIII Palaoelogus, Emperor of Constantinople, 1424-1428 (reverse), Pisanello (c. 1438–1439)

Physical

Opening and examination
  • More reliable
  • Risk to the object
  • Carried out by trained officers

In case of suspicion.

What to do faced with a suspect consignment

  1. Isolate

    Set the consignment aside.

  2. Photograph

    Document the object.

  3. Search

    Consult the BIOP.

  4. Decide

    Seize or release.

  5. Report back

    Inform the unit.

Signs of suspicion

An inspector

Fishing Boats along the Beach, Eugène Isabey (c. 1830)
« A successful check is often a matter of detail: a poorly chosen code, an invoice that is too clean. One has to have learned to see it. »
Lieutenant Samir Haddad, customs inspector

Vocabulary of control

Packing list
List of what a parcel contains.
Seals
Marks guaranteeing that a parcel has not been opened.
Under-declaration
Declaration of a value lower than reality.
Freight forwarder
Professional who organises a transport.

Frequently asked questions

Can a check damage the object?

Officers are trained to handle fragile property.

What to do as a freight forwarder?

Provide all the documents and the OIMAP number.

How do I challenge a seizure?
Where can I find the sheets?

Useful documents

Contacts

The Doge's Palace, Venice, Richard Parkes Bonington (1826)
The Doge's Palace, Venice, Richard Parkes Bonington (1826)
Heritage Protection DepartmentParis — Headquarters+33 1 00 00 03 00protection@oimap.exampleMonday to Friday, 9 am – 5 pm

See the customs codes

Arrival of the "Southern Barbarians" (c. 1600)

Classifying cultural property.

Customs codes
Image credits (16)
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