Making my own file disappear would be cool.
I don't know how its like in other congregations, but in the one I'm currently officially at, the secretary likes to fax over the letter of introduction to either the secretary or the PO of the other congregation. He even confirms the congregation number and the name(s) through someone he knows at the Georgetown Bethel.
So I may just have to settle on their keping the file but no more tabs on me.