In this question: http://dinonline.org/2017/07/09/checks-found/ The actual question was around checks found that the org. would have owed others (not charitable). I don’t know if these were paid with other checks and the checks I found are “doubles” which were misplaced. Do I need to send the checks? Thanks.
Now that you found these checks that may be money that is owedd to these people it would be like Hashoivas Aveida, meaning that if they were written to a Yid, and he will say that it wasn’t paid for then it should be given to him.
Conversation with Horav Y. Cahen Shlit”a