Yes rabbits have false pregnencys.
give her anywhere from 12 hours to a week for babys after fur pulling, some does pull a week in advance some pull just before delivering.
It all depends on the doe.
feel around every inch of the thest box she could have had them you just havent felt them yet
congradulations on the Blue Fox litter.
what is /was her due date? usually 2 days past they can give birth and I have some fox who wont deliver before day 35.
again all depends on the doe.