I really do not know it was a few years ago that I lost the book

speaking of lost books though. I had my college degree show last week and the whole thiing was focused on my comic that I told you about. Well I go in today to take the show down and my comic wasn't on the shelf. My class mates and the class below us said it was there in the morning but after lunch it had dissapeared.
After a bit of searching it was clear that it had been stolen! I was so LIVID, i've never been so angry in all my life. Yes I could make copies and whatnot but this was the original, the one I had worked my *** off and poured so much of my heart and soul into.
Thanks to CCTV and a bit of detective work we found the culprit and he returned it but his excuse was a downright lie! He's a mature student in his 30s from the HND art and design course which was also showing with the rest of us so he KNOWS how precious an item on display is to the owner, plus there was a sign under my shelf saying that if anyone wanted a copy they'd have to pay for one.
His excuse was that he thought it was a freebie he was allowed to take. Now A - The price sign plus common sense should have told him that it was not for sale and that if he couldn't see the sign he should have looked for it or asked someone. B - On the CCTV he clearly walked around the room, through the tables in the middle and went straight to my display, took the book without so much as a glance to anything else on show and tucked it away in his shirt out of sight and walked away again. Do you not think that is damn suspicious?
Anyway I'm glad I got it back but I am not satisfied with his reasoning for taking it whatsoever. I still want to make him suffer for putting me through so much anger and worry.