Please take this. (All keys claimed)

So I had a little trouble with HumbleBundle regarding their "hidden region-lock" scheme from their other recent bundles (Codemasters Bundle, in this case) in which I traded with a certain person on trades for a gift link of "DiRT Showdown". Apparently, there is no indication whatsoever to where the key is locked so I would like to ask your help in figuring out this mystery.

Here is the code:

DiRT Showdown

2(Letter after O)7(5 + -2)A - R(-7 + 5)8(Letter before X)M - 2/8/L/E/R

Here are some extra keys for grabs:

PAYDAY 2 - Lycanwulf and The One Below Masks - B2NJT-G0H47-(VEE)(ARE)(EFF)WE

Woodle Tree Adventures - (QUEUE)2GPG-7NV(FIVE)R-ELMAV

Please leave me a message to whoever claims the key and tell me what region you are in. Thanks!

EDIT: (ALL KEYS CLAIMED, DiRT Showdown key was locked in South America Region)