I bought 2 of these I have 3 cats rec on Thursday set them up with the litter from other litter boxes so the scent would be there but also knowing my cats being very fussy I left a regular litter box open style out just in case ???? It's now sat nothing in new covered boxes all in open old one ???  Soo I took the cover off and they did use the new ones without the dome buttt. Nothing changed litter all tracked sooo going to put the cover back on and give it more time !!!!   Otherwise 30 days for return policy spent 124.00 sooo hoping they will work !!!!