Yes, do keep checking in with your cat sitters. It will keep them on their toes and make you feel better. Too late now, but perhaps you should have installed a Nanny Cam!
Hey, that's what you can do. Everyone under 50 seems to have a smart phone with a camera in it these days. Ask for daily pictures! I always send a few photos (not daily, but regularly) when I am sitting for my friend's cats for a month every year. It makes her feel better, even though the cats are in my house and she trusts me.
