Struggle with getting Rockworms

So far I might have opened up 500 chests at least. I have only been able to get 3 rockworms. And is wondering if this is a bug, I get dozens of all the other commons, this starting to be very annoying, since I am going worms, and want to upgrade them.

Anyone?

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Are those all gold keys?

They rockworms won’t be in higher level keys.

If those are all gold keys, then you’ve had some odd luck.

Yeah, gold keys. Not sure if its possible to have this odd luck, since its a common troop. Might be a bug.