So, the short answer is I don’t think I would feel comfortable having them in the living room (where you have had problems before) on this short timeline. However, I do think if you moved them into the kitchen now, and they had zero problems until you left, then you could just have them live in the kitchen together during your trip. Be sure your pet sitters know what trouble signs to look for (like fur tufts, any aggression, etc), and have back-up housing set up in case they need to be separated. I would really only do this if they were acting 100% bonded in the kitchen (lots of cuddling, litter box sharing, food sharing, grooming, etc.) with no aggression in that space.
The absolute safest option is to keep them in their current separate set-ups. This may be less stressful for everyone since you won’t constantly be worrying about how they are doing and there wont be the risk of fighting with unfamiliar people taking care of them.
Once you get back, I def agree with getting rid of the wood litter box, because even with vinegar cleaning I’m sure she still recognizes it. The other suggestion I was going to make is to set up his separate pen in the living room as well, and have them in side-by-side pens. Since he’s been in the guest room, she’s still be able to claim the living room as hers. Doing some additional pre-bonding where they live side by side in the living room, with side swaps every day or two should help her start to lose track of what her territory is so you have a smoother transition to their final living space.
From personal experience, I did something similar to option 1 before (I had them live in the neutral space while a pet sitter was there) and it was nerve wracking. That was actually the only bond I’ve ever had break on me. Whenever I’ve had a timeline for bonding things tend to go south because I try to go by arbitrary timelines instead of actually basing decisions off of the buns’ behavior. So if it were me, I would probably just keep them separated for now, and then focus on more pre-bonding in the living room once you return.
I totally understand wanting to make things easier for the pet sitters, but I’m sure they would rather clean two litter boxes than have to deal with bunny fights!
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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.