Interesting! Did they say why they would be harder to bond?

If you don’t have neutral space (maybe a bathroom?) then I would pick a room and keep them out of it for the time being. Clean it really well and when you start bonding it should be a lot more neutral. For semi-neutral, BB’s bonding info page has some great advice for creating a semi neutral area. After bonding usually it’s suggested that you re-arrange and clean the area that will be their new home which in this case is your entire home. I think you can avoid re-arranging your whole house but I would still clean everything really well. You can de-bunny smell carpet by sprinkling baking soda on it and letting it sit for a bit before vacuuming it up. You can also do this to cloth furniture. And just wipe down most other things with 50/50 vinegar/water. Once all that is done I would re-introduce them slowly to larger and larger areas. This is also good for re-litter training as littler habits are often an issue after bonding. If they seem to have territorial issues in specific spots or rooms that might be a sign that it needs to be cleaned a litter deeper.

I would also talk to them about fostering to adopt. You can wait to finalize until after they are bonded so if bonding proves to be too difficult/is just not working you haven’t committed to being a forever home. I think it’s strange that they don’t want to do a bunny date. While it’s not a 100% indicator if they get along in a meet and greet that they will bond it does help rule out bunnies that will be really hard/impossible to bond. Some bunnies just hate each other right off the bat. So I might want to do one anyway just to make sure there’s not immediate “I want to kill you” dislike…. Haha, this is coming from someone who has 5 bonded rabbits and has never done a single “bunny date”. >.>

Anyway, just my thoughts on it all. Hope some of it was helpful and you can find a good match for you boy buns!