There are typically some dead bees in a nuc when you get them. Once installed they clean house by carrying the dead out to the front and dumping them. By day 5 though you really should check that the queen is out. Previously we’ve had to scrape a little away to make sure she could get out with the bees help. If she’s not out today I would certainly remove some of the candy enclosing her. But not all of it, make them get her out..but I honestly can’t back that up with anything other than that’s their job.