2 peoples names are on a receipt for a shed, one dies

It depends on the circumstances, but there seems to be a fair argument that if two names are on a receipt for personal property and one dies that the other is now the owner.  You would need to deal with the person appointed by the probate court to administer the estate.  If that person is agreeable, you could move the shed.  If not, you would need to petition the court and make the argument of why it belongs to you and should be moved.  Good luck.