Lost Backpack

About six months ago I found a backpack/work bag in my front yard, thought it belonged to my son and just took it inside. Decided to take a look inside and found a wallet with over $700 in it! Plenty of ID but from another state, but then I found a mobile phone and search through until I found 'Mother' and then rang that number. Lady said her 26 yr old son had been in my suburb the night before and left his bag on the roof of his car when he drove home so it must have fallen off at the corner near my house. She was shocked when she picked it up to find all the money still in it. They had recently moved here and knew nobody so she was very happy to find someone honest. I kept thinking "of course the money would still be there, he earned it not me!"