Dang, John, sorry to hear about your escape!
I have had many escapes, and I have always found them relatively quickly. All of my escapees were found within about 10' of their cage, so concentrate on that area first. Inside dressers, under beds, inside beds, etc. I found one guy about halfway up the backside of the refrigerator, curled up in the coils, which were warm. I have had better luck searching at night, and have also stumbled across some of them by accident. One I found before I knew he got out!
Just look, look, look! You will find him! Try to think like a BP. Where would you go from his cage if you got out, and how would you get there?

Good luck, and keep us updated!