Possibly.
These maggots were quite large(a little smaller or equal size to botfly larvae). Larger than the air holes, which makes me think your secondary hypothesis. Unless the larvae stage is bigger than the adult stage?? Or they have a really fast growth rate in the past 2 days ......
Either way, it was one of the nastiest things I've ever seen and I've seen quite a lot of gruesome stuff that didn't bother me. I just hope not have a repeat experience again......
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