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If you added the games through Steam using those keys you can't see them again and you don't need to.
What games and why?
But, as I said, such keys can be gotten from the library entry via the "View CD key" menu entry.
Try not to give up on the GOTY version, read this and maybe contact WB for help. https://support.steampowered.com/kb_article.php?appid=200260
Maybe this can help: http://pcgamingwiki.com/wiki/Batman:_Arkham_City#Issues_fixed
Some crash issues are solved there.
Since trades do not require a serial number or anything remotely similar like that, it's obviously a scam of some sort. Trades involve putting his item and your item into a trade offer and sending it to the other person, that's it.