Blue Bottle Flies quick ?

Hi guys, just wondering if anybody else has experienced this. I got the 500 BB spike larvae and they have been in my fridge. Do they eventually just die? I had no problems the first time I ordered them. However with this batch, none are hatching out. It has been over 2 weeks and I have put them on a heat source and close to light.

I just realized I've had them in my possession since the end of January so it has been over a month. Is there a possibility they all died in my fridge? Last time I left them in the fridge too long, all that happened was that they hatched inside the container in which they were contained while inside the fridge. Thanks! I'll probably just order another batch, but wanted to see what you guys though as well.
 
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