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

Report a suspect work

You think a work offered for sale is stolen, looted or fake: how to raise the alarm without accusing, without exposing yourself and without compromising the investigation.

Updated : October 28, 2026· 4 min read

A doubt is enough

Nowshera, Kashmir (number 1000), Samuel Bourne (1864)
Nowshera, Kashmir (number 1000), Samuel Bourne (1864)

An operator or private individual who comes across a work of murky origins has an essential role: they are often the first who can raise the alarm. Reporting a suspect work is confidential, protected and requires no proof.

A quarter of the records in the BIOP database come from such alerts. In 2024 they made it possible to block more than two hundred sales and to identify eleven resale networks.

This page describes the warning signs, the procedure and the protection of the reporter.

  • Suspect
  • Alert
  • Confidentiality

Reporting a suspect work in figures

26%Share of suspect alerts
200Sales blocked in 2024
11Networks identified
100%Confidentiality guaranteed

Source: OIMAP Heritage Protection Department.

Breakdown

Online listings38%
Auction sales24%
Galleries and dealers20%
Private individuals18%

Places where the work was encountered.

The warning signs

Several signs should alert you: a price far below the market, a seller in a hurry or evasive, a provenance that stops abruptly, incomplete or contradictory documents, transport requested with no supporting document, a payment in cash or by a third party with no apparent link.

Taken separately, none of these signs proves anything. It is their accumulation that justifies a report. If in doubt, do it: the analyst will judge, and a good-faith report exposes you to nothing.

Carnet (1863–1865)
Carnet (1863–1865)
Gathering among the Members of Office Censor-General (1700s)
Gathering among the Members of Office Censor-General (1700s)
Teapot with Landscape and Imperial Poem, Chen Hanwen (1762–95)
Teapot with Landscape and Imperial Poem, Chen Hanwen (1762–95)

How to report

Reporting is done online on the Desk, under the heading "Suspect work". The form asks for the description of the work, the place and date where it was seen, the possible identity of the seller, the nature of the suspicions and the documents you hold, such as a screenshot of the listing.

You may ask for anonymity: only the BIOP unit will know your identity, which it will pass to no one without your agreement, save a court obligation. No liability falls on a good-faith reporter.

What the BIOP unit does

An analyst examines the work, compares it with the database, checks the stated provenance and, if need be, contacts the national authorities. If there is no match, they may open a watch: the work is followed for several months and the reporter is informed if anything new occurs.

In case of a match or serious suspicion, the unit alerts the competent law enforcement. It never reveals to the seller the existence of a report: this rule protects the investigation and the reporter.

A civic role

Reporting a suspect work is not reserved to professionals. Many private individuals, students and visitors to salerooms have raised the alarm. Everyone can contribute to protecting heritage by staying alert and passing on what they observe.

Professional organisations now build this reflex into their training, with a clear message: a good-faith report is not an accusation, it is a service rendered to all.

Sign, risk and reaction

Four signs
SignRiskRecommended reaction
Price far below marketTheft or fakeAsk for the provenance
Interrupted provenanceLooting or spoliationSearch in the BIOP
Evasive sellerReceivingRefuse the transaction
Payment by a third partyLaunderingReport

Landmarks

  1. Encounter with the work

    Observation.

  2. Reporting

    Confidential form.

  3. Analysis

    BIOP unit.

  4. Decision

    Watch, alert or closure.

Do not confront the seller

La Belle Jardinère: le magasin de la rue de la Cité pendant sa demolition, Paris, Charles Marville (1864–66)
La Belle Jardinère: le magasin de la rue de la Cité pendant sa demolition, Paris, Charles Marville (1864–66)
Document Box (Ryōshibako) with Chrysanthemum and Plum (lid) (late 1800s-early 1900s)
Document Box (Ryōshibako) with Chrysanthemum and Plum (lid) (late 1800s-early 1900s)
Lace Towel End (c. 1700s–1800s)
Lace Towel End (c. 1700s–1800s)

Report or simply refuse

Carved Lacquer Scroll Box (1736–95)

Only refuse

Do not buy
  • Protects you
  • Does not protect others
  • The work can be sold elsewhere

Minimal reaction.

Boy with Cigar (c. 1855)

Report and refuse

Alert the unit
  • Also protects other buyers
  • Helps the investigation
  • No risk for the reporter

Recommended reaction.

Report a suspect work

  1. Observe

    Note what you saw.

  2. Document

    Capture listings and photos.

  3. Declare

    Complete the form.

  4. Keep quiet

    Do not alert the seller.

  5. Follow up

    Answer requests.

Useful elements for the report

An auctioneer

Seal with Two Qilin Playing (1849)
« I reported a lot that looked dodgy to me. Three weeks later, the police thanked me: it was a piece stolen from a museum. »
Étienne Lamarque, auctioneer

Vocabulary of suspicion

Receiving
Holding property that comes from an offence.
Monitoring
Following a work without a public alert.
Anonymity
Non-publication of identity.
Spoliation
Unlawful dispossession of property.

Frequently asked questions

Am I liable if the suspicion is false?

No, every good-faith report is protected.

Can I remain anonymous?

Yes, the identity is known only to the unit.

How do I follow my report?

Through the Desk.

Where do I report in case of proven theft?

Useful documents

Contacts

Roman Ruins, Villa Pamfili, Hubert Robert (1774)
Roman Ruins, Villa Pamfili, Hubert Robert (1774)
Heritage Protection DepartmentParis — Headquarters+33 1 00 00 03 00protection@oimap.exampleMonday to Friday, 9 am – 5 pm

See the active alerts

Bidri Hookah Bowl with Roses (c. 1650s)

The current alerts.

Active alerts
Image credits (16)
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