Oh my, well.
Does do not feed when stressed, the buck being there (quite likely getting her pregnant again right after or even during giving birth), moving the nest (was there one? First timers sometimes mess that up, the buck sure didn't help), trips to the vet, moving kits to and fro, that all stresses the doe.
It can take up to 48h for the milk to drop, most feed within 24h, but with all that going on and being a first timer...
I really wonder what that vet checked, they hold their milk back unless they decide to feed. Rabbits stay away from the nest all day, nurse only for a few minutes once or twice a day, mostly around dawn and dusk. You might never notice, since many does do not go near the nest if they feel watched or if anyone is around.
What they need most is rest, quiet and privacy.
If there wasn't a proper nest you can make one and line it with fur (if she didn't pluck any you can try and pluck sone from her chest), dryer lint, cotton, etc., and you can put a heating pad or bottle of warm (not too hot) water in a towel to one side of the nest - the kits wiggle to where the temperature is just right. 2, or one kit might have trouble keeping the nest warm enough. They need to be warm, since their digestion doesn't work when chilled.
When I have to move a nest, for a few days I restrict the does movement to a rather small cage or hutch with the nestbox, lots of food, water, litterbox and enough space to stretch out. I dunk her nose into the nest a few times to show her where it is.
Unless there's a very good reason (like cold weather) I wouldn't pull the nestbox out, at least not until I'm sure they got fed.
What are you feeding?
Before feeding some replacement I would try to feed them on the doe, either by flipping her and latching the kits on, or by putting a towel on your lap, kits between your legs, and put the doe on top - there is a risk that she injures the kits with her claws if she struggles, keep that in mind.
I wouldn't have high hopes for this litter if the doe doesn't feed soon, but be prepared for a possible next one in 4 weeks.
Good luck anyway,