it's hard to convince myself, at least at the moment, that theft -- intellectual theft, in this case -- does not fall under the cases when negative feedback can be used.
I'm more pragmatic: plagiarism is dealt with by forum rules, and if something is handled by forum rules, it shouldn't be handled by the Trust system.
Sadly, it would be no point in reporting those posts, because they are older than 6 months and reports will get (almost) automatically marked as Bad.
I've reported old posts, and as long as it's for the right reasons (so not "
We generally do not moderate posts this old for on-topicness, substantiveness, multi-posting, and other "cleanliness" issues."), it gets handled.
Why care about Bad reports anyway? I think Bad reports as prove I don't only report the obvious cases, but also report the edge cases where the Mod can decide.