All ferrets work differently if only slightly . Hobs can generally turn a rabbit easier hence a lot more spade work to dead rabbits , But if it's a day there just not shifting then good Jill's should stick . I have a few Jill's that have no interest in dead rabbits if there's more to be bolted. and my young hobs the same , pushes on , they may return on a scent trail to the mark, which thankfully confirms and when there's 6foot of sand between you and a rabbit, you want to know it hasn't moved lol. Sand is challenging very wide tubes . If the ferret can't pin it it's moving. .