Some people build their own “neutral territory” by getting a piece of scrap linoleum to cover the floor and an x-pen, with the sides covered by blankets so they can’t see where they are.
They mark territory by scent and also chew marks! So any toys or carpet that’s been chewed will be easily recognized.
Car rides in a new box, dates in a large bin or laundry basket, and the bath tub are all good starting points.
You said the bath tub went well, so I would stick with that for a while to let the good behaviors solidify. It sounds like you just moved away from that too fast. Then you could open it up to the bathroom floor… then maybe a makeshift pen.
White vinegar is the best thing to remove bunny scents from things.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.