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

Report a loss

A work mislaid, lent then not returned, lost in a house move: how to declare it and find it without accusing anyone.

Updated : October 28, 2026· 4 min read

Losing is not stealing

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

A work can disappear without any offence being committed: it was mislaid during a house move, forgotten in a storage unit, entrusted to a provider who has vanished or lent to a person who never returned it.

In these cases, the procedure is more flexible than for theft: the declaration of loss is made without a complaint, with an alert that is lower priority but just as visible. About 14% of reports concern losses.

This page details the common situations, the information to supply and the further searches.

  • Loss
  • Loan
  • Estate

Reporting a loss in figures

14%Share of losses in reports
48 hPublication of the alert
31%Lost works found within 3 years
2Minimum documents to supply

Source: OIMAP Heritage Protection Department.

Breakdown

House move32%
Loan not returned26%
Estate22%
Storage unit12%
Other8%

Circumstances of the losses declared.

Common situations

House moves are the first cause: boxes mislaid, crates sent to the wrong address, works forgotten. Loans not returned come next: a work entrusted to a friend, an exhibition or a restorer, and never returned. Estates pose a particular problem, because a poorly inventoried inheritance can hide a missing work.

In each case, the essential thing is to date the last known presence of the work and to gather the traces: invoices, photos, letters, testimonies.

Carnet (1863–1865)
Carnet (1863–1865)
Gathering among the Members of Office Censor-General (1700s)
Gathering among the Members of Office Censor-General (1700s)
Plaque (1500s–1600s)
Plaque (1500s–1600s)

Making the declaration

The declaration is made on the Desk by choosing "Loss". The form asks for the description of the work, the date and place of the last known presence, the circumstances, the steps already taken and the person to contact.

It is advisable to attach a sworn statement and, if the loss occurred at a provider, a copy of the contract and exchanges. OIMAP issues a receipt for the declaration, useful for insurance and for administrative procedures.

Finding a lost work

The BIOP unit publishes the alert, but the initiative stays with the owner. Contact providers, neighbours, former tenants; question insurers and carriers; consult lost-property offices and local sales. Many lost works are found within a few months.

If the work is found by a third party, the BIOP record makes it possible to reach you. The third party can contact you through the unit, which guarantees the protection of your contact details.

Avoiding losses

Losses can be prevented. Entering each work in an inventory, photographing it, keeping a register of loans and movements, mentioning works in house-move or storage contracts are simple actions that avoid most disappearances.

For loans, a written contract stating the duration, the condition of the work and the conditions of return is the best protection. OIMAP offers a loan contract template in three languages.

Loss, theft or loan not returned

Characterising the disappearance
SituationCharacterisationFirst reflex
Mislaid workLossDeclaration on the Desk
Work disappeared at a providerLoss or theftFormal notice to the provider
Loan never returnedLoss or breach of trustFormal notice then advice
BurglaryTheftComplaint

Landmarks

  1. Finding of the loss

    Last presence.

  2. Searches

    Contact the providers.

  3. Declaration

    OIMAP receipt.

  4. Alert

    Publication.

  5. Follow-up

    Update of the record.

A loan not returned is settled in writing first

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)
Chemin de fer de Toulouse à Bayonne. Pont de l'Aran (en trois arches de 17m d'ouverture chacune). Situation des travaux au 21 juillet 1861, Édouard Baldus (1861)
Chemin de fer de Toulouse à Bayonne. Pont de l'Aran (en trois arches de 17m d'ouverture chacune). Situation des travaux au 21 juillet 1861, Édouard Baldus (1861)
Farmhouse on the Slope of a Hill, Fra Bartolommeo (c. 1508)
Farmhouse on the Slope of a Hill, Fra Bartolommeo (c. 1508)

Discreet declaration or public alert

Mercury (Budha), from a Mandi Astrology Series, Sanju (c. 1810)

Discreet

Record reserved for law enforcement
  • Avoids alerting a good-faith borrower
  • Remains available to investigators
  • Possible choice for loans

Measured option.

Boy with Cigar (c. 1855)

Public

Alert visible to all
  • Maximises the chances of finding
  • Informs all operators
  • Recommended in case of serious doubt

Most effective option.

Declaring a loss

  1. Date

    Fix the last known presence.

  2. Search

    Contact the persons concerned.

  3. Declare

    Complete the form.

  4. Obtain

    Receive the receipt.

  5. Follow up

    Update the record.

Elements to gather

An heiress

Seal Color Box (1662–1722)
« Clearing my mother's house, we found that a painting was missing. The declaration allowed us to find it with a distant relative. »
Clémence Aubry, heiress

Vocabulary of loss

Formal notice
Letter demanding performance.
Last presence
Last certain date of possession.
Receipt
Proof of declaration.
Estate
Transmission of the estate of a deceased person.

Frequently asked questions

Must I file a complaint?

Not necessarily for a loss, but keep the declaration.

Does my insurance cover the loss?

Depending on the contract.

Is the alert public?

Yes, unless discretion is chosen.

What to do if the work is found?

Inform OIMAP immediately.

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 how to report a theft

Portrait of a Naval Officer, Lai Fong (1870s)

The procedure for thefts.

Report a theft
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