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fkw I kind of figured not many would post, because there is no real proof either way (yet).
(I know Im repeating myself here 
Oh well)
The first and only arguments I have heard/read on these cards not being legit was because they had never been seen before 2005, so some say they have to be modern fakes (a fantasy issue) made recently. At least 2 people have identified them as exact copies made from the photos in a early 1950's Cuban Winter League yearbook/program with the exact same caption font and all.
Your right, someone (recently) could have gone through the trouble of just cropping the photos and adding a new caption, then printing out dozens of different cards, then printing the "Trinidad y Hno" ad on the back, and then glueing them to an album page then removing them. But it would be tough to duplicate the exact font, exact placement of caption on every card etc. Why would someone do this, and have a bunch of noname $9 cards? If they were that good at it why not make Cabanas or Punch cards that are worth 10-100X more?? And why not print more than one of each player?? I have yet to see a duplicate..... I believe all the known cards are all from one "find", and all with similar album residue on the back.
To answer you earlier question, I only have 7, with the best one being Napoleon Reyes. I paid between $9-$25 ea.
Cant say they arent rare, so I like em anyhow, they sort of remind me of those 1921 Herpolsheimer cards, with the same sort of discovery and same "only one known of each player" thing.
The seller I have been buying these from, also had cards last year that had never been seen before, 1949/50 Ansco Film Habana players (19 uncataloged players, all newly discoved and each one a "one of a kind"), but no one doubted they were authentic. Ansco Film Habana cards
Trinidad y Hno did make premiums in the same era, so why not cards???
(1949/50)
cubanball.com Trinidad y Hno premium photo
(1948/49)
http://www.cubanball.com/Images/BBCards/MiscSets/TriniTeam/triniteam.html
Oh well..... I was thinking/hoping there would be more info on these cards by now. I know many have written off the Polar cards as fakes (because of the photo selection being American, and also because they had not been seen before)
Im not going to write on these anymore....... but if someone comes up with new info Id be happy to here about it.