I think all snakes try to get out of their enclosures. It's only when they are so desperate that they are willing to injure themselves that you know you have a problem. When I started, I kept my BP in a shallow sterilite tub. He was fine for several months, but then he began pushing on the lid with his head. He would push until he developed a lump on his head. Once the lump healed, he'd go back to pushing. I built him a much larger enclosure and he stopped injuring himself. He did not stop trying to escape. He would still surf the glass of upgraded enclosure, rubbing his face along the edge, and looking for a way out. He just didn't do it to the point of injuring himself. I don't think anyone will ever build an enclosure that's so nice that the snake doesn't try to escape.