I’m not sure why but a cheque book came through for me today and printed on the envelope was the statement “Disguised Mail”.. Seems to defeat the point if the mail is supposed to be disguised,
Edit: I’ve tracked it down.. my wife had already un-disguised the mail! The white envelope came in this envelope with a printed but “hand written” style address:
The stamp and post mark in the top right are genuine and not printed.. so someone, I presume, in the post office takes the paid / postmarked bank envelope, prints my address on another brown envelope.. sticks a stamp on it and then post marks it.
Seems a bit inefficient. Weird too..