The rabbit hole I filled in is still filled in. There may be another hole deep in the bottom of the only part of the hedge that is thick and prickly. I have shoved a thick off-cut of fence post into the hole to see what moves. If that is active then a lot of digging will be needed to get at the main hole and continue to discourage the rabbits from our site and our vegetables.
I'm starting to think about the plot plan now too.