LIMA, Peru—A research team from Peru’s National Institute of Culture claims that Yale University has more than 40,000 artifacts from the Incan site of Machu Picchu, or 10 times the original estimate, Reuters reports.

The artifacts left Peru after explorer Hiram Bingham, a Yale alumnus, rediscovered Machu Picchu in 1911. The South American country has claimed that the objects were loaned to Yale for 18 months, but they still remain at the university nearly one hundred years later. As part of an agreement to repatriate the relics, the Peruvian research team came to the U.S. last month to take of inventory of the Yale holdings, which include pottery, jewelry, and bones.