But it was 5 years ago...
Considering that the posts Xal0lex found were written 5-6 years ago...
Plagiarism has no statute of limitations. It's written about it clearly and understandably here -
Writing a welcome message.
Plagiarism: If you copy some text from somewhere, then you should have a good reason for it, and you must link to the source. Doing otherwise is plagiarism. Changing a few words around doesn't matter. If we find that you plagiarized, then you absolutely will be permanently banned, even if we find it years after you did it.