I think it was in the late 90’s or something
There was a national defense purchase in the 2000's where sniffers and such were installed to detect bombs or biological weapons ~ but they don't sort mail.
BTW, magazine volume is so small these days special sortation for them is never going to be in the cards. The big employment centers to hit are RURAL POST OFFICE POSTMISTRESSES AND THEIR RELIEF CLERKS.
We don't need those facilities and haven't needed them for the last century!