Oh, we know they've eaten before, and apparently quite well. The breeder is reputable.
The male has lost a substantial amount of weight since we first got him, and I don't like seeing skin hanging off the sides of him.

They're in bins, all the others above, below, and beside them all eat ever week. (7 day feeding schedule).
Humidity is high up at 60-70% and we've never had a bad shed.
Temperature is 90-91 hot side, a bit above room temp at the cool end. It's dark enough they should never need hides, but we tried giving them hides at the start, it's not made a difference at all.

They're the only two in the whole collection that refuse to eat. We thawed rats the way the breeder did, we have everything else identical to his setup except bedding (we have aspen, he has coconut husk).

It's not husbandry. They're not ill. They're just very annoying. It's only the male we worry about though, as he's getting thin. The female, well they can go off feed around that size for some time, and she's lost a little but not anything amazing, she'll eat whenever.