i had lost my hampster 2x, i usually put peanut butter on the floor or a bowl of food. you can put a box on the floor put food in the box, make a stairway to the top, your hampster will fall into the box to get the food but won't be able to get out. that's the best i can tell you
Hehehe, once I left the lid open on one of my hamsters cages... He climbed out in the night, I woke up, turned the light on and he was sat there eating a conker... WEll, nearly jumped out of bed (I have a bunk bed) and managed to get him back in. And another time another hamster managed to open her lid... I went upstars, sat on my chair and heard this snuffling noise. Then Anya came out, cheeks nearly burting, so I got her in, then took all the stuff she'd put in her cheeks out from her lader.