Oh no....... Where is the hamster?

I let the kids buy a hamster. They saved up for several months and finally purchased it. The name I have used so far is "it" or "the hamster." The kids call him Jerry from Tom and Jerry. I am not a fan of pets, so this has been a stretch for me. Corbin found out how to open the cage and get "it" out. So far the hamster has been found behind the bookshelves, in the couch, and behind the water heater. We finally put a lock on the boys room. Hopefully this will stop little curious hands from opening the cage.