About 8 yrs ago i worked at an apartment complex where wed have to go do maintenance in diff apts and sometimes the occupants werent there...one time i went to one apt and i saw 3 100 gal tanks...but only 2 snakes....rtbs which didnt freak me out and no i didnt turn them in but since i had to be in there by myself i did want to know if the 3rd one had snuck out or was it not there...i never found out and their shower stall was back in working order.
Oh btw if you look around, there is armoirs that are pretty big and you can retrofit it to hold your snakes in tubs. They have 2 doors and the humidity wouldnt be so much that youd have no problem but if youd like, you could seal the inside with a coat of polyurethane and that will take care of any of the humidity getting into the wood itself. Good luck