Hmm, indeed, there are more keys off. Then I still believe someone flipped around the caps, just more of them. Note the positions of the parentheses: "(" is on the "5"-key in the numbers row on top, like on standard French AZERTY, but the closing ")" is in the middle row on the right (French would have it to the right of "0"). That is extremely odd - I am not aware of any layout that has "(" and ")" on different rows except Slovak, and Slovak has one directly above the other.
As far as I can tell, all the key caps are French, just the positions are off here and there. Thus I still think someone got their hands on a French Mac and fiddled with the keys to make it more English. This cannot be done perfectly, so they prioritized some keys and ended up with some leftovers like the ")".