Do as search on here. Lots of posts on this and answers regarding tips. My youngest BP escaped twice, once when he was just a 100 grams or so. Lid on a tub popped open. The 2nd time, he was probably a few hundred grams more and I also thought he couldnt pop the lid, didnt have the locks on. Surprise surprise. The 2nd time he was out for a few days, maybe 4. I found him far from his tank. I tore my apt to pieces looking for him and he was in the one place i figured he wouldnt be. So look everywhere, especially close to his tank first.

good luck.