A method for sharing a data set including multiple classifications of security between one or more entities andor between one or more organizations. A fresh-air duct is provided in the interior of said housing and is mounted substantially in parallel to the base plate and spaced apart therefrom at a predetermined height. The plunger includes a feature for engaging the shaft, and the sidewall preferably includes a expandable-contractible portion, in which the feature is formed. The method involves the carrier reading the identifying information contained in the radio frequency identification tags on each mail piece while each mail piece is in the trays or tubs and removing one or more mail pieces in the tray or tub that are to be routed differently than that routing information contained on the outside of the trays or tubs.