Black fuzzy worms with new crickets?

[UNDEAD ELMO]

So I went and picked up 100 medium crickets today and put them in their bin. I just cleaned the bin before I put them in so I know it was empty. I dumped the crickets in and instantly found 20+ little black fuzzy worms in there with them. Is this a concern or just random? I usually always get my crickets from there and have never seen these before. Are the crickets safe to feed still? Here's some pics of them. Sorry I can't get a close up with my crappy phone camera.

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[Eavlynn]

Dermestid larvae. They'll turn into little beetles eventually. Insect breeders with large colonies often add dermestids as a cleaner crew insect. I just toss them out when I get them.

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[UNDEAD ELMO]

Dermestid larvae. They'll turn into little beetles eventually. Insect breeders with large colonies often add dermestids as a cleaner crew insect. I just toss them out when I get them.

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Oh that makes sense since I found a little beetle too. Thank you!

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[Hdrydr31]

Yep just a cleaner bug harmless