As of this post, I have gathered all the previous information posted, and am currently organizing it into a spreadsheet. I'm putting it into two pages, one listed by area, and the other listed by moga. Hopefully this might show if either of these determine what cards drop.
I will share the spreadsheet once I get all the information organized. In the meantime, if anyone sees this before posting, I request you clearly include both the place and moga you found your card from, that way we get more complete information.
I am also separately keeping my own card-gathering data. I will then be able to compare this to the whole set of everyone's data, and maybe test someone's earlier suggestion that it was specific to each person.