found

Is it permissible for a Muslim to keep money that he or she has found lying around? I have heard people saying that we must not keep such notes /coins, and that they should be given in charity. Others have said we may accept them as rizq (livelihood) from Allah. Which is more accurate?

Dear sheikh, As-Salamu `Alaykum! If a Muslim finds something that is lost how long does he have to wait before he can claim it and what are the procedures when he finds something?