when u shift congregation, the new body of elders will contact the old ones and request your cards and records and will often recieve a "letter of recomendation" outlining your good (and bad) points.
now to my thinking, what would happen if u faked a letter, hmmm?
and got them sent to u?
all u need is the letter head from any old congregation.
my father was the P.O. for many years and recieved letters like this all the time, they were simply sent to our house. then he'd hand them over to the secretary at the next meeting.