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Ok, so from the message you received there is no doubt you are banned (and not locked-out of the account). As I said, I took some time to try to find your deleted posts un google+google cache, but was not able to come across a plagiarized post. Of course google cache holds content at a certain moment in time, and there is no trace of changes to the posts. I did not find all the deleted posts either on the google cache.
It’s quite a cumbersome task, that deemed no results. Ideally, a mod could check the reports to give you the exact post that caused your ban and the reason (plagiarism, ban evasion, etc.).