If you get a flashlight can you see back there? Is it safe? If its relatively safe, I would leave it. Moving or accidentally destroying the nest can cause a ton of stress for mommy to be. After they are born, you should avoid sitting in that chair for a while to ensure safety. After they are born, once a day check their tummies and warmth

You can also put them in the nest box once they are born (put all the hay and fur she pulled and collected in there too) it should have high sides otherwise they can wriggle away and if they get out of the nest and away from the rest of the litter they can die from going cold. Mommy won’t put them back in the nest, so if they get out, you have to pick them up and put them back.

If she is feeding them, the tummies are round and in the first few days you can see kind of a white tummy (from the milk). Bunny moms only feed their babies once a day, and a lot of times they don’t feed them the first day. . good luck with the baby buns

Agree with the others, if the nest your bun is making looks reasonably safe, the best thing to do is to let her carry on with the location she’s chosen (and not sit in that seat for the next few weeks for safety’s sake). If she’s built the nest and pulled fur, her kindling time is likely quite close. She’ll probably give birth in the nighttime hours (which seems to be the favorite time of day for rabbits to bring their kits into the world), so the first indication you’ll likely have of the new babies is when you go in to check how she’s doing and see movement in the nest. At that time, as Josip says, you may be able to move the babies and their nest to the nestbox.

As Josip and Mikey say, check them once a day after the first day to see that they’re OK; they should be warm, snuggled up together in a cute little pile, with plump bellies translucent with milk, and wriggling around or sleeping soundly. They should have their fur start to grow in within a few days and generally their eyes open and ears go up about (I think) 10 days or so after they’re born. By 2-3 weeks they’ll be totally adorable little fluffballs and you can start very gently interacting with them to get them socialized with humans. They should stay with their mother for at least 8 weeks (some say 10 weeks is even better) until they’re weaned and able to eat hay, pellets and greens and drink water. Make sure to keep the two adult buns (father and mother) separate; this is chiefly to prevent any further pregnancies, does can get pregnant again almost immediately (as in an hour or two) after giving birth.

You should check the other bunny (or get someone who knows to help) to see what sex they are; they should be spayed/neutered to prevent future accidents. The mother also needs to be spayed, though probably not while she’s still nursing her kits since she needs to be with them until they’re weaned (which goes right back to the necessity of keeping the two adults separated). By odd coincidence, I just adopted a mother-son pair; the mommy came to the rescue having just recently kindled four kits, all of which have survived and thrived, I’ll have to ask the Friends of Rabbits folks when the mother was spayed. The kits themselves should also be spayed or neutered when they reach sexual maturity.

Good luck!

Greens should only be introduced super gradually, one at a time, after 12 weeks.

Little ones, once very near weaning, should have alfalfa pellets and alfalfa hay offered in conjunction with mom’s milk, to get them used to solid food, and then gradually transition to solids only.