Rob,
I googled Maralex International, and found their Ebay shop, their own websites (two different ones that I saw [an eu one and a uk one], and found them on a trade-related website ... all this in addition to their Amazon shop. They appear not to be a small-time dealer with time on their hands to mess about faking CF cards
Yes, I think you're being too cynical

Really, if you can't tell the difference between the real cards + the fake ones without using specialised equipment, then the difference is negligible anyway, so why worry if they're "fake" when they cost half the price of "real" ones but still do the same job, to all intents + purposes
EDIT: If these 'crooks' are using real packaging but fake CF cards, what are they doing with all the real cards that came in the packaging that they are using for the fake ones