I've been robbed and feel …

Would this make you angry or sad for the guy? He’s obviously made some poor decisions in life.
We had a rather odd event happen last week that I’m guessing does not happen too often in smaller towns. A rather suspicious looking guy, who looked about forty five but may have been only thirty, came in the shop and went to a tucked away spot to ‘browse’. I kept an eye on him but didn’t catch anything. After he left I still didn’t see anything out of place. It was his return visit a few days later later that I found – well, more sad than anything. He came back into the shop trying to sell me an odd looking Jimmy Hendrix statuette, a dvd, and a book. Of course the book looked a little familiar but I couldn’t immediately place it. I just said no thanks. On his way out he said he was just trying to get five bucks for lunch, tried to make me feel a little guilty. After he left I double checked my inventory and sure enough the book he tried to sell me was one that he stole from me on his last visit (minimal value). Imagine being so fried that you can’t remember where you ‘acquired’ your products, or perhaps so desperate he just didn’t care.