I can't speak for other states, but this stuff comes unraveled for me at the point when it becomes apparent that the claimant doesn't understand the first damn thing about voting in Arizona.
You have to present photo ID here to vote. If you vote in person, that ID is scanned and a ballot is printed on the spot with a control number tied to that ID. Mail-in ballots have to be requested in writing with a facsimile of your ID. and again, the ballot is specific to you and your photo ID.
I'm not saying the system is fool-proof, but when someone starts making claims about unmonitored drop boxes, it tells me they're clueless.
Hell, we had a hand recount of Maricopa County by a pro-Trump group that in the end, found slightly more votes for Biden than the official tally. They (The Cyber Ninjas) did present some concerns to the Senate, but those have all been answered by Republican election officials here.