DV, comment welcome; I think MI’s ballot counters know how many unfilled-in-for-president ballots there are, from their recent certification.
If on the recount, there are suddenly enough filled-in-for-president ballots to tip MI, then Katie bar the door ...
http://www.freerepublic.com/focus/f-gop/3499194/posts?page=21#21
Of course, they know. They know how many ballots were cast in total...and they know what the count was for each presidential candidate. Subtract the counts from the total ballots...and you have the number of ballots which weren't voted for the presidency.
If that number changes significantly...or if the total ballot count changes significantly...the alarm bells will start ringing.
It's hard to cheat at the re-count stage. It's the initial count that can be manipulated.