Why do you have a health guarantee?
My response was "because I don't know what kit is going to stress at being in a new place and which ones won't".
A kit that stresses...you know within 24 hours. They stop eating, they pout in a corner, they are basically saying I'm an unhappy rabbit.
99% of all rabbits...they move to new digs and they are perfectly fine with the change. This assuming that their needs are being met. Clean cage, no food changes, no unusual treats.
BUT that remaining 1%.... I don't know why but they stress. I subject my kits to cage changes, time away from mom, new roomies, feed changes so I expect them to be good to go when they leave home. And most of them are, but sometimes you get a kit that just doesn't like being away from home. THAT is why I have a health guarantee.
NOW what to do if you have a stressy kit.
1. tempt them with safe greens. I generally recommend parsley. Tends to go over really well with bunnies. And if it is soaked in water first, also gets extra fluids in them.
2. don't bug 'em. Give 'em a safe place to be and just leave them alone.
Generally that's all they need. IF it continues into day two I tend to recommend people bring them back and I'll get them the first available next kit of similar value. (my choice on that kit).