Value of autographed baseballs?

Hello all,

First time visitor to this newsgroup, hope I am in the right place.

My girlfriend, who is Venezolan, was talking to me about baseball, her
favourite sport. As I am from Europe, I have no clue about the game,
but anyway, we were just chatting away, and she told me she has some
signed baseballs from Venezolan players.

Now, she is not really interested in selling them, however, our
curiosity was sparked regarding the value of these baseballs.

I understand from a search on the web that there is much more to it,
but maybe it is possible for some frequent posters here to give her an
idea if she has something (potentially) valuable in her hands?

These are the autographed baseballs:

Magglio Ordoñez (Detroit Tigers, former White Sox)
Johann Santana (I do not believe this man needs an introduction)
Alfonso Carrasquel (I believe he was active in the sixties)


Anyone of the "locals" want to give us an idea?

TIA