Isn’t motor action, or motor function, what you’re asking about instead of mechanical action.
Can't believe the Sheriff or some of his investigators haven't noticed the very strange placement of the 80 on that form. I think he has and isn't revealing that yet.
I also believe that Postal Inspectors would find that date very INTERESTING. Have worked with Postal Inspectors during Geo. H.W. Bush's term when he would receive hate mail (fairly often) or suspicious looking packets and various other unrelated incidences -mailbox tampering, theft by postal workers (all too frequent) and I have found the Inspectors to be very efficient and professional. Unfortunately any Inspectors I was acquainted with have long since retired.
To a postal worker, that is such an obvious, glaring forgery I truly believe somebody is looking into it but have to wonder how the forger thought it would pass close inspection.