What litter do you use? I use wood pellets and happy with them, I also keep hay separatly from toilet box, not for all my rabbits, but some of them (girls) also messing with hay so I find it better to use only wood pellets and some straw sometimes. I had grates for Bernie and Smokey as they like digging their litter boxes, I used kitchen metal cutlery trays removed inserts ant they worked fine, now they are better I don't know why but they still like digging their boxes but don't make too much mess around so I just let them do it. Bernie especially constantly reorganise her box, moving wet pellets on one side and makes place for herself she wants to lay in there but just on plastic, then moves everything to another side, I am not sure why but there's no more mess around her box so I just let her do what she likes. Her feet are spotlessly clean she's a very tidy girl. Smokey (in my avatar) is not so good she uses her litter box but also can pee outside of it sometimes and lay in there so sometimes I have to clean her with baby wipes. Hopefully she'll get better after spaying, fingers crossed.