I generally remove most of my hamster's hoard when I clean her out each week, but I leave enough so that she doesn't notice.
The only exception to this was when I bought my hamster a corn on the cob toy for her to gnaw on. When I came back the next morning, all of the corn was in her food storage - she must have spent the whole night gnawing it all off!
When I saw that she was eating nothing but corn all day I had to dump it, - such a waste!
