I think this could of been what happened with mine. Waited for them to shed out and then offered them both hoppers. Both did not feed. Waited probably two more weeks and offered hoppers again. One took it the other did not. So I gave the second hopper to the one that did. Next day I tried a rat fuzzy/crawler and the one took it.
6qt tubs, no hides or anything. Guessing they will be strong feeders.