I hope they've already fed, & I hope you found out what they're eating? (live or pre-killed, fresh or frozen, mice or rats & what size?) It's important to feed exactly what they've taken previously, for best results. (
BTW, I'd wait probably a week before offering food, unless their behavior suggests they're "looking for food"- it would also be nice to know when they fed last, besides "what" they were fed.
I would strongly suggest leaving them alone as much as possible to settle in for a while- no handling until after they've eaten at least 3 meals for you at regular intervals (about a week apart is typical) without refusals for anything other than being in shed.
Right now, of course they're defensive- they're afraid & have no idea where the "world they knew disappeared to"- so easy does it- they need time to adjust & feel safe. Eating is job #1 and stress makes that a challenge.