[Lucas00]

Definitely not all fake.

I'm most curious about the 1950 Jackie. It looks decentish from here. The '53 Topps Jackie as well looks possible.
Both could be easily disproved if I had a better pic.

None of the pre war cards look good.

Others that look possibly good to me are
Aaron AS
'55 and '57 Aaron (big maybe)
'60 mantle (big maybe)
Ruth look n see
Both Mays All stars
'56 Mays (big maybe)
Fleer koufax

I'm quite certain the all star Aaron/Mays and the Ruth look n see are genuine.

Would be easy to tell in hand, also these pics are pretty bad. Need good close up pics outside of plastic with no glare. As well as back photos.