Actually, Dirty Beech, in his book "Confessions of A Union Buster" Martin Jay Levitt explains one of the go-to moves of the union buster is mess with the seniority list they are required by law to supply. He specifically mentions addresses not just supplying flat out wrong addresses but also moves like changing street to avenue etc on voters they know will be pro-union. They also perform moves like pulling pro-management pilots out of the office and onto the line (look at IRL and DRL).
I don't get a vote so I can't attest to whether or not this is a widespread problem but it does seem to match up, in theory, to the way union busting is done. However, in fairness it sounds like the NMB caught the issue before it became a problem and put the right addresses on the envelopes so I don't know that it will affect the outcome.
My question is how many times are they going to use the same 50 year tactics with such disregard for the intelligence of their own pilots? It almost makes guys like TP, FW, PD, MR, ME, MR, RA, LK etc who are pushing this decert for them seem even dumber than originally thought.