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No indicator in them. That worried me too.
I've bought them in the past that didn't have an indicator. It's easy enough to take one out and see if it gets warm. You can do this right before you use them, or reseal the bag afterwards, or even transfer them to a small jar or something to keep them sealed. The one that got warm can be put back in with the others also as long as it hadn't been out for long. It only takes a minute or two to check it.
 
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