Games are Steam keys, 1 game per key, no bundle and no DLCs.
If you have no idea which games are in, how possibly can you know that keys are valid?
The keys are valid.
It is probably some keygen or something like that.
Do not accuse people without any reason especially if you don't have any proof of what you're talking about. Read the post again and you will see that escrow is accepted.
1 random Steam game = $0.4