I probably would, too, but if I didn't want the laptop found and wanted to leave no paper trail to follow, I'd sell it through a "wanted" ad. I've never been to a pawn shop myself, but aren't you supposed to have ID to sell expensive items?
I know you do on jewlery as my sis did it, but that was to make sure it wasn't stolen. They run it automatically she said through the police dept. I would guess, if she had too provide ID, and if the laptop was not stolen, then it would be a mute point to the pawn shop. Now are their legit and non legit pawn shops, I dunno...