i had the same thing happen with a 4 year old mole king,
i have cats and one of them had a (bad) habit of warming her ass on the top of the kings tank, well i guess one day she jumped off the tank (probably from my spray bottle) and the lid partially slid open and i didn't notice it.
well two days go by and i think nothing of it, then out of nowhere both the cats keep darting in and out of that room and being really strange, so i get mad and get up to go yell at them.
I walk into the room and they are both screwing around by a tv stand thats pushed up in a corner, batting under it and such.
so i go over to where they're at and look under the tv stand and there is my mole king, cold as hell, freaked out and covered in dust bunnies.
So i dig her out from the tv stand, put her back in her tank, then took duct tape and taped the sliding lid so it wouldn't open again unless i removed the tape.
don't know if that helps but i thought it had some relavence to your problem
Good luck! (get a cat maybe? JK!)