When a non-Jewish friend from my hometown was visiting me where I now live, I gave him a gift of scotch. After receiving the gift, he then accidentally left the scotch at my home. I will be returning to my hometown for Pesach, but will get in right before the holiday so there will be no time to return the item to him.
Is it permitted to keep the item in my parents' home until such time during Pesach when my friend can retrieve his property? And how does it interact with the chometz selling my parents will do?
My guess is that it is not different from having chometz stored that you sold to a non-Jew, and would be unaffected by a chometz sale of theirs, even one that triggers after, because they do not own it, but I'm sure there are nuances I am not considering.