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When I come across a post that seems familiar or otherwise likely to be plagiarism I pick a distinctive phrase out of the post and do a google search like this:
"" site:bitcointalk.org
And if there is more than one result then I report the post and in the comment field I mention the number of hits returned by a google site search of the key phrase. This is less cumbersome than trying to put a link in the comment field to an identical post, especially when there might be *hundreds* of identical posts to choose from.
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This works only for the users who copypaste from the forum, but there are a lot of spammers here who just copy a website or article (usually a fresh article about bitcoin from a decent news site) and opens a new topic, paste the article and "forget" to mention the source...
They are hunting for merit, because they think that if the other users see these long posts and the posts are good quality (because they were copied form a bitcoin news website) they will get merits.
If you just copy a few sentences from the middle of the suspicious post and try to search for it like this:
""
and without the /site:bitcointalk.org, it will list you the original article.
You can find a lot of examples in the dedicated copypaste topic:
https://bitcointalk.org/index.php?topic=1926895.0