Share 'What to do with a lost disc, that you cant return?'

I have a stack of discs in my closet that don't belong to me. I'll find a disc with a name but no number or email. If I don't know the person I ask everyone I see at the course I found it at, and continue to do so for weeks. Sometimes it just happens that nobody knows the owner of this disc. What is the proper etiquette in that situation? They are all just collecting dust. I've considered donatin…