My understanding is that every letter and parcel that goes through the U.S. Post Office is image scanned, for both routing and security reasons.

If this is the case, where's all the scans of these ballots if they were indeed mailed through the U.S.P.S.?
What was the count of the total number of ballots that were officially received through the regular U.S.P.S. mail?

If any of these claimed mail-in ballots were not proven to be mailed via U.S.P.S. image scans, then they must be thrown out as being invalid, as there is no chain of custody for them.

Yet another potential way of proving this almost certain fraudulent election.