Informative comments like this one deserve more upvotes.

In the United States, misprision of treason is a federal offense, committed where someone who has knowledge of the commission of any treason against the United States, conceals such knowledge and does not inform the President, a federal judge, a State Governor, or a State judge (18 U.S.C. § 2382).

Pennsylvania data shows that some of the mail in ballots were returned BEFORE they were mailed: https://threadreaderapp.com/thread/1325538470593400832.html

There is another angle that should be considered:

https://twitter.com/DawsonSField/status/1285215731366461440