They are likely to use them as unintentional littler boxes.
Rabbits do like a hidey-hole of some kind, but you’re better off turning that box upside down so they can hide under it instead of jumping into it. Lots less cleaning, which means healthier rabbits.
The two armies met. But instead of battle, they decided to eat some pie and contemplate this tiny ad:
a humble home and a large garden will erase stress from the rat race