This all started about 3-4 months ago. At the time, he was having issues with arthritis in his back him. Sometimes he would use it, sometimes he would go on the floor. A friend suggested I'd take him to the vet because he looked like lethargic. Luckily we already had an appointment because it turns out he was diabetic (Oh yay)
Gotten all that taken care of and he's back to feeling like himself (Although backhip still gives him issues from times to times) despite all this he still doesn't want to use his litter box all the time. For a while, he kept trying to get into the smaller littler box that our youngest cat used but it was simply to small for him but yet he would drop something on the floor while being half in and half out.
Recently we got a bigger box and cleaned out the litter and that hasn't helped much. I've even been keeping the top off of it at night and that sometimes does the trick but not all the time. I'm tired of walking into the room and having a present waiting for me (I must point out, that these presents look very normal) The other day I caught him in the act and put him in the box and he freaked out like he didn't like the feel of the litter.
Tonight I ask for some advice. I have no idea what more to do. I'm not about to get rid of him because of this but I need a solution to why he's not wanting to use his litter box all the time. (BTW, we use fresh step)