Thats just aweful!!!!! I agree that putting out a piece of carrot or something to attract them.
I keep my mealworm colony in a three drawer plastic unit. It seems to be working very well and its alot more organized that just having bins.
Hope you get all your wormies back 
Red 
>>My cat jumped inside through my window and RIGHT into my bucket of mini-mealworms, and then out of that, causing it to flip over & empty all of nearly 2000 mealworms out!!!
>>
>>UGHGHGHH I scooped up what I could & then started vacuuming.. Finally got one spot cleaned, turned around for 1/2 a second and back again, and there are another million of them right there where I just got it cleaned!!!!
>>
>>What do I do?!??!? I vaccuumed for 15 minutes and I'm STILL seeing them!!!!!!!!!!!!!!!!
>>
>>~~Dusty
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>> So Many Alleles, So Little Time...!
>>@
>>~~The Gecko Barn~~
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Crested Gecko Zeek:1.0, Ziggy and Zeus
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
New Girls: Flame, Karma, Bubbles and Bell pics coming soon
Chip: 1.0 papillion (small dog)