Introducing something new to your rabbit

A rabbit that sees something new in its space usually does nothing at all. It looks at it, walks around it, and gets on with its day. Sometimes it thumps once and leaves the room.

That isn't rejection. Rabbits are territorial and predictability is what safety means to them. Anything new has to stop being an intrusion and start being theirs before they'll use it. In practice that takes a few days for most rabbits, longer for nervous ones.

Put it where they already are.  A new hutch in a corner your rabbit never visits will take weeks. The same hutch inside their existing territory gets claimed much faster. You can move it later, once it's theirs.

Make it smell right.  Put something that already smells of them inside or next to it — a used piece of fleece, some hay from their current spot, a handful of their own litter in a corner of the new tray. Scent does more than patience here.

Don't put them in it.  Lifting a rabbit into something new teaches them the thing is where they get picked up. Leave it open, leave it alone, and let them go in on their own.

Feed near it, not in it.  Put a bowl or a pile of hay beside it for the first days, then just inside. Good things happening nearby does most of the work.

Expect a mess first.  A lot of rabbits will test a new object by chewing it, marking it, or moving things around inside. That's claiming behaviour, not a problem with the product.

If after two weeks it's still being completely ignored, the location is usually the reason, not the rabbit. Move it closer to where they actually spend their day.