If they dig into it and decide that you did it yourself, as the parent suggested, then yes, you would have a serious risk of prison time for willfully violating the NSL.

Did someone hack your email account?

You would expect such a claims to be severely scrutinied (including seizing all involved hardware for forensic analysis), and if you'd be making a false claim while having disseminated the information yourself, that would be a crime by itself in this scenario.