I really wish I had some advice for this issue, but I just don't have any idea. I had a corn snake escape his enclosure in my house (that's an interesting story for another thread, or PM)...never did find him, and that was 4-5 years ago. It sounds like a lot of the commenters have good ideas, so I would try all of that. I really hope you find him, as I'm sure he was a beautiful BP, and as an albino, probably wasn't cheap.