Someone stole my psp.?

This may take a while but i need help so here it goes.A month ago my friend had a sleep over and invited me and 6 other people 2 a sleepover at his house.I took my PSP with me and my headphones a 1 GB memory stick which had all of my songs and videos on it and a Bad News Bears UMD movie.i had my psp with me the whole night and before i went to sleep i set it on the table in the living room.I had a saturday detention the next day so my dad picked me up early and i was really tired.i put my clothes and sleeping bag in a bag.a put my headphones in the bag too.When i got to the saturday detention,i looked in my bag and my psp wasn't there.I just thought that after detention i will swing by and pick it up.When i went by my friend was'nt home so i came by later and we looked all over his house for it.it wasn't there.I knew that everyone at the party but one kid (who i didnt like) had a psp so they wouldnt take it.Then one of my friends said he was missing 3 DS games.I knew someone stole them and my PSP.The next school day the boy i didnt like rode my bus and showed me "3 new games he got at gamestop".They were the same one's that were missing.I said that my friend was missing them and told him to give them backe.Obviously,he said no so i said well what about my psp and he said that he did'nt have it (ya right) and that i can come check his house for it.I would but idk where he lives so for a month i've been without my psp (which was my most prized possession).Please help me i want it back sooooooooooooooooooo badly.