I'm not sure that posting a notice like that would get your laptop back at all, or even if so, how much big $$$$$$ the person(s) would try to hold you hostage for it. You would probably be better served just giving a description of the lost laptop rather than revealing what is on it. Anyway, leaving a laptop on a bus is the height of absent-mindedness IMHO, not like leaving a cell phone, which is much easier to lay down and overlook when you leave the bus. That is one big brain fart..:-D