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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. I'm sorry to hear about this this situation. I would absolutely take the lid off as a step to try and help with this. Sometimes the lids will trap more odor in the box and make it not as pleasant in there. I would also get a second litter box too as some will like to urinate in one and defecate in the other. I would make sure that the litter box is easy to get into as some older ones may not want to get into them as much if they are challenged from a mobility aspect. Cleaning the litter box daily would be recommended too. Trying to keep the environment in the litter box as clean as possible is most desired. The areas he's defecating, I would try to limit his access to them. The spots he's going, you can put tin foil over them to deter him from those spots.