Anonymous isn't / wasn't You can use either one. You may be talking about the time when the information was sent ( wasn't ), or you may be talking about the fact that the information you got is there before you now ( isn't ). Native speakers do not agonize over such fine distinctions.
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Anonymousisn't / wasn'tYou can use either one. You may be talking about the time when the information was sent (wasn't), or you may be talking about the fact that the information you got is there before you now (isn't).