How do you find a game in trades where the sequel has been released?

There is no need to be sarcastic. Steam trades has no discussion board, so its not a stretch that someone might use these boards to ask a simple question.

I'm not sure about that but, ever since it came back up after being down, it has had a large upsurgence in bots and G2A-traders, which definitely can obsfucate the more reasonable users of the site. A lot of the older (and more casual-minded) traders seem to have gone inactive, as well, which isn't going to help the overall impression.

It's still (afaik) the absolute best trading site by a large margin, though, so.. gotta work with what you've got. I've still gotten a fair trade or two during the periods I've been active of late, each one only a few days in length, so it seems to be working just fine if you don't mind sifting through junky offers. The site does have an ignore function, so the more bothersome ones can just be blocked.

Because it's so much faster than waiting on discussion threads, all of the sellers migrated from steamtrades to barter, unfortunately.
If you care about such things, simply check if they redeem their trades or if they are collecting multi-copies and you can spot them immediately.

that helps a lot. I should be able to use that for the other games I am having a problem with now and in the future.