Pest insects in cricket shipments happen with almost every company. Most are very harmless and won't spread if you're keeping your crickets properly contained, not to say a dermestid would infest your home anyways, I'm not very familiar with them.
Looks like a dermestid to me too. I get them in my roach colonies sometimes. They have never been a problem and they eat any insects that die too. I have fed them out to a few different types of reptiles with no problems.
I've got both the larvae and the beetles in every shipment of crickets that I've received. I have been just vacuuming them out when I clean the cricket bins out.
Pretty interesting to find out what they really are though.