I've done that. Usually each morning i check out the mealie bowls in case any of them have died or mutated into an alien. The aliens go into my alien box and the dead ones are always put into a plastic container so i can see if they are actually about to change and aren't dead. I had forgotten about this container and went to grab what i thought was an empty one only to find it had beetles in it LOL.
Red 
>>Okay, I cleaned out my geckos' cages on Monday, and, the first thing I did was I took out the dead mealies in their dishes. I then carried on with the cleaning of their "home". Well, I forgot the dead mealies were there(in a plastic dish on my desk), and today went to check in on my leos. Looked in the plastic dish, wondering why it was there, and **surprise** a beetle was in there!!! ....It scared the crap outta me...At first I was thinking "AAA my house is infested!!"..Then I remembered...And felt really stupid..LoL..Had to share..
>>
>>Alyssa
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Crested Gecko Zeek:1.0
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
Chip: 1.0 papillion (small dog)