We always have cottontails in our yard almost all the time. We have a small shed that is between our house and garage. It is about 10ft from our back porch and another 20ft from our garage. They actually dug a good sized opening to crawl under our small shed. They typically go from under our shed to our neighbors yard that is a straight shot from the shed. THey have also dug a small opening under the nieghbors strange plastic porch attached to garage.
I have never seen any “rabbit holes” people talk about. We always have bunnies in our yards and it seems to be moms coming to have babies and then the babies hang out and have babies. So they are never the same buns. Their markings are similar but I am so obsessed with them I spend a lot of time “talking” to them when I see them outside. lol Even my husband talks to them. lol
The rabbits probably may or may not know the building is deserted. If it isn’t noisey and free of predators like our yard then I imagine the museum is a great place for them to live.
I truely believe our wild buns know we wont bother them so that is why they keep coming back. They aren’t fearful of us but at the same time if we try to get closer than about 10ft then they will run. But they have no problem letting us talk to them when they are out.
You said that Mimzy was found there. Do you think a domestic bun would know where to go? Typically our domestic buns have no idea how to survive outside unless they have been out for awhile.