The U.S. State Department is investigating the whereabouts of a $5,800 bottle of whiskey the Japanese government gave to Secretary of State Mike Pompeo in 2019, according to two people briefed on the inquiry and a document made public on Wednesday.

It was unclear whether Pompeo ever received the gift, as he was traveling in Saudi Arabia on June 24, 2019, the day that Japanese officials gave it to the State Department, according to a department filing on Wednesday in the Federal Register documenting gifts that senior American officials received in 2019. Such officials are often insulated by staff members who receive gifts and messages for them.

American officials can keep gifts that are less than $390. But if the officials want to keep gifts that are over that price, they must purchase them. According to the filing, the State Department said the bottle was appraised at $5,800.