What cute and adorable pictures of them both!! I love them all!!

Now on to a couple of your questions. The not covering his business in Emily's box is a dominance thing. He is leaving his mark on her box and wants to make sure she doesn't miss it! A few of mine do that too and as long as he's using the box I wouldn't worry about it.
The sneezing and head shaking could be the beginning of a URI or it could be seasonal allergies and it also could mean that he is getting an ear infection or mites. It's so hard to tell which one it could be. Can you look in his ears and see if there is any black stuff in there? If so then it's probably mites. I would keep an eye on him and the sneezing to make sure he isn't getting sick. I'm sure others may be able to help you more.
Keep us posted!
{{{HUGS}}} and kissies to both!!