I also received a trial version, which makes me think all the keys of this game that were given away are actually trials.

just click on "received" button, no need to blame me, I don't have a key for the full key and I won't get it for you. Or you want to report me or something? You got this key for free and if you give away a lot of keys and you think you deserve exactly what you want in return it's your problem. I am not the only one who gives away these trial keys

Hey,

If you did not receive full game keep status as not received. Do the same with all other instances where you receive trial key.

Only exception is when you activate key, full game is added to your library but game has "for beta testing" tag. It means that keys given away by developer or publisher were generated before game was released (that's why Steam adds "for testing" tag to them). In this case try to install game, make sure you have full version and mark giveaway as received.