[fintstone]

Notches are probably at the bottom where double ones are supposed to go. The rejection tabs (if those have them) are to keep you from doing just what they did...put more circuits in the box than it was designed for. It is really not an unheard-of practice to do this to make them fit (as in your box). If an inspector noted it on a house sale, you might have to fix (might not meet code in some places).