LOL maybe this is true. My dumeril's boa got out last year when she was still in her 110qt tub. I had used clips on the sides for months with no worry. Then just one day, she was strong enough to flip them open! I found the enclosure empty with the clips all over the floor LOL.
I found her curled up in the bag of clean aspen in the bathroom!! The bathroom door was closed too, so she had apparently squashed herself under the door crack, which is only a centimeter tall.
From that day on, I stacked my suitcase on her tub that weighs something like 20 lbs. And I now stack heavy books (really heavy books) on all other snakes who are still using stand-alone tubs.
This is what I do. I use a soldering iron to make the holes. It works well. The clips cost 88 cents at Home Depot and for that tub I use 3 of them. I made zip tie hinges on the back and just clip the front. It would take a lot of force to get out..