if your husbandry is ok, ie. temps, hides, humidity, perhaps you can try offering them crayfish, as I have found pesky dumeril's to come around and start feeding on crayfish, and then slowly work them over to mice/rodents. It's worth a shot. I would worry about whether the animals are properly hydrated first, that may be the underlying cause to their "lack of appetite". Most wc monitors are severely dehydrated while in the possession of dealers/importers/retailers... they leave it to you to get them hydrated and healthy, as it usually means too much work and effort on their part, or, they simply do not understand the needs of the animals, and neglect to provide them with the proper temporary holding cage, until they're sold. Hope this helps.... make sure that the animal/s in question are drinking on their own, whether it be when you mist them, or from a bowl in the cage...
Cheers, have a good one,
bob
THe Odatriad