My advice keep them warm (hot spot of 88-92), tight (6 quarts tub will work perfectly), on aspen (can be very helpful to get stubborn feeder started) and feed live.

Your priority is to get them started those import did not likely get started therefore it's gonna be their very first meal, they will need to be stimulated and F/T will just not cut it.

Offer live than after 3 to 5 feedings try to convert if this is what you want to do but for now your priority is to get them started.