I just received this message from The_maestro27:
"#1: They wont give you extra keys just because you say they were stolen
#2: You sent them as gifts
#3: Selling humble bundle codes is forbidden (Each purchase is intended for use by one individual.)
#4: There's absolutely no way they'll believe you since you sent them as gifts
#5: Learn from your mistakes (same applies to everybody else ;) )
#6: Happy Easter "
Time for some screenshots and I suppose there's no need to wait on reporting him to GOG and HIB support. How sad.
This is why I will not trade anything on these forums, not as long as we don't have a system for trading, which GOG will never implement.
Steam has a good trading system, use that instead.