I've been all over the house, looked everywhere the hints list told me to look and still only have 8 baseball cards. I don't know what else to do. Is there a glitch in the game?

I spent a lot of time searching them as well. The one I particularly couldn't find was under the couch pillow by the table with hidden drawer.

Another nasty hidden one is on top floor on the window next to bed, behind nightstand.