Q. If someone left a small closed cup of common commercial yogurt on a table in the communal kitchen of a Torah institution. He then left the room and when he came back, he found a similar cup on another table. If he is not sure if it his cup (they all look the same), or maybe it belongs to someone else, since it was in a different site and he cannot claim any siman or mark to recognize it. Can he eat that yogurt?
A. Horav Shlomo Miller’s Shlit’a opinion is that he should wait some reasonable period of time to see if someone else returns and takes it. If not, and he feels that if there was really another yogurt cup owner, he would have already returned and claimed it, then he can take it as his and keep it.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a