I'm having troubles with reptiworms as well. My last two orders were shipped incorrectly (wrong address, had to be re-routed, requested to hold at post office but were sent on the truck...). My last two orders arrived nearly all black, most were dead. My last order was for 500, I only got ~200 fed before I couldn't find any more live ones. The living ones, WOULDN"T WIGGLE either. I had to roll them around on Moose's hammock to get him to eat them.
I've got silks, horns, butters, and some more reptiworms (they were free) coming from lindasgonebuggie- hopefully today. I'll see how he feeds on the other worms. But I think I'm either going to switch to phoenix worms (or attempt to, anyway) or try raising/breeding silks if he prefers those. Even my first few orders from reptiworms didn't move as much as I would have liked. They just don't grab his attention the way wax worms do... And the soil they're shipped in is stupid, it takes 5-10 minutes to sift out clean worms for him to eat.