The game doesn't tell you how much cards are there...it just tells you how much you've scanned from the ones you know of..
Thanks to Heatran5400,
We are now only missing the names of:
257-266, 270-321, 393, 394, 400, 402, 405, 406...
But... still missing categories for 40->73, probably the Aurum (Alien stuff) and some unaffiliated..
Also you can see the symbol of the category when you are showing the 3d model in the game's list
and
you can see the color that represents that category (in the title of the information screen)
i.e: Stage idols have a grayish-green color so that might be the color on the cards...