I dunno about your keys (do you have a cat or dog? Bird? Ferret?), but orbs are pretty much always found to be the flash reacting with dust or bugs in the air. So I wouldn't worry too much.

As for the face, there's a phenomenon called pareidolia that causes people to see faces in all sorts of random things (including carpeting, clouds, textured walls, and so on), so unless it's really well-defined (i.e., everyone sees it without prompting or coaching), it's probably nothing to fuss about.

If antiques were routinely haunted, I'd have so many stories to tell--I used to work and live in an antique store (and the house itself was a hundred years old)!