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

Operation reviews

The annual results: 23 operations in 2024, 847 works restituted in total, counting method and lessons learned.

Updated : October 28, 2026· 4 min read

Measuring to act better

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)

Each year, OIMAP publishes a consolidated review of its international operations. The 2024 review lists 23 coordinated operations. The cumulative total of returned works stands at 847. These figures are official; the breakdowns shown on this page are indicative.

The review is published in the first quarter of the following year, after validation by the States concerned.

It is supplemented by the details of ongoing operations and the list of partners.

  • Reviews
  • Figures
  • Audit

Annual reviews in figures

23Operations coordinated in 2024
847Works restituted (cumulative)
1 / yearPublic review
Q1Published in the first quarter

Source: Events and Communications Directorate.

Breakdown

Europe35% (indicative)
Africa25% (indicative)
Asia-Pacific20% (indicative)
Americas and Middle East20% (indicative)

Indicative regional breakdown.

What a review contains

The review includes a statistical summary, a presentation of each completed operation, a table of returns and an analysis of trends. It also describes the difficulties encountered: procedural delays, disparities between legal systems, language barriers.

It is published in French, English and Spanish, in accessible PDF format, with a two-page summary intended for the press and the general public.

A Rocky Cove with Fishing Boats, Allart van Everdingen (late 1650s)
A Rocky Cove with Fishing Boats, Allart van Everdingen (late 1650s)
Châteauvieux-sur-Suran, Antoine-Claude Ponthus-Cinier (1848)
Châteauvieux-sur-Suran, Antoine-Claude Ponthus-Cinier (1848)
The Storm, James McNeill Whistler (1861)
The Storm, James McNeill Whistler (1861)

How we count

An operation is counted in the review for the year in which it was closed. A work is counted as returned only once the physical transfer has taken place and been certified by a report signed by both parties. Works that have been seized but not yet returned appear under a separate heading.

This method avoids double counting and makes years comparable. It is checked each year by an independent auditor.

Lessons of the year

Three findings emerge from the 2024 financial year. First, cooperation between administrations is all the more effective when officials know one another: operations preceded by joint training were completed more quickly. Second, the online market has become a major arena. Finally, returns are faster when provenance is well documented.

These lessons inform the following year's work programme and the Academy's training modules.

Returns in detail

Returns are classified by type of object and by region of origin. The review states the average time between seizure and handover, as well as the cases in which an amicable settlement avoided litigation. Each notable return is the subject of a short note.

Images of the returned works are available in the photo library, for editorial use with credit.

Indicators tracked

Four indicators
IndicatorDefinitionFrequency
Closed operationsNumber in the yearAnnual
Restituted worksCumulative since inceptionAnnual
Return timeAverage in months (indicative)Annual
Countries involvedParticipating StatesAnnual

Milestones

  1. First public review

    PDF format.

  2. Independent audit

    Data verification.

  3. Public summary

    Two-page version.

  4. 23 operations

    Official figure.

Official figures

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)
The Fleet Off the Coast, Beachy Head, Samuel Atkins (c. 1790–1805)
The Fleet Off the Coast, Beachy Head, Samuel Atkins (c. 1790–1805)
View of the Gulf of Pozzuoli from Solfatara, Philipp Hackert (1803)
View of the Gulf of Pozzuoli from Solfatara, Philipp Hackert (1803)

Full review or summary

A Boat That Has for Sails the Wings of a Huge Bird, Filippo Morghen (about 1769)

Full review

Detailed report
  • All operations
  • Method and data
  • Lengthy document

For professionals.

View of Venice, Jacopo de' Barbari (1500)

Summary

Two pages
  • Key figures
  • Quick reading
  • Less detail

For the press and the public.

Reading a review

  1. Browse

    The summary.

  2. Identify

    The official figures.

  3. Browse

    The operation notes.

  4. Check

    The counting method.

  5. Cite

    With the reference.

Before citing a figure

An auditor

Bridge of Shops, Srinagar, Kashmir, Samuel Bourne (1864)
« The crucial point is to define what is being counted. A returned work is counted only when it has been physically handed over. »
Éric Sandoval, independent auditor (example)

Vocabulary of reviews

Review
Annual document of results.
Cumulative total
Total since inception.
Closing
Official end of an operation.
Audit
Independent verification.

Auditing and correcting

The data are verified by an independent auditor, who checks a sample of files. If an error is found, it is corrected in a revised version published under the same reference, with a note of the correction.

States and partners may request clarification on any line of the review. The Directorate replies within thirty days.

Frequently asked questions

When is the review published?

In the following first quarter.

Is it free of charge?

Yes.

Can the data be obtained?

On reasoned request.

Where can I see what is ongoing?

Useful documents

Contacts

The Pyramid of Cestius, Rome, Michiel van Overbeek (c. 1650–80)
The Pyramid of Cestius, Rome, Michiel van Overbeek (c. 1650–80)
Events and Communications DirectorateParis — Headquarters+33 1 00 00 07 00evenements@oimap.exampleMonday to Friday, 9:00 a.m. – 5:00 p.m.

See ongoing operations

Temple of Athene Nike. Venus Victrix—Wingless Victory, Dimitrios Constantin (c. 1850s–60s)

What may be published.

Ongoing operations
Image credits (17)
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