Pallet companies treat wooden crates and pallets to kill pest living in and on the wood. I want to find out once treated barring repair to the pallet or crate do I ever have to treat it again.
Are the pellets mixed with other things, like grain? If so, the rabbits probably like the grain better than the pellets and are digging to find it. If not, then maybe they liked the food you were using before better, and are looking for it.