Is it permissible to own a watch that was seized after it was evaluated by an expert and its value was paid as charity on behalf of its owner?

It is permissible to donate the value of the watch in the name of its owner, and then benefit from it, provided that its value is returned to its owner if he appears, unless he permits the charity for himself. The value of the lost item is considered on the day it was donated or on the day its owner became known if it was destroyed.