Abstract: A shelf and divider assembly comprising a rigid shelf unit with a plurality of shelves includes removable and collapsible fiberboard inserts which partition the shelf spaces laterally and vertically and which lock in place behind the corner posts of the shelf unit.A literature storage fiberboard insert is removably installed between rigid shelves by downward and inward folding of end locking segments on horizontal shelf panels to positions wherein the locking segments clear the corner posts of the shelf unit. After the fiberboard insert is in place between shelves, the end locking segments are folded outwardly to their normal positions of use wherein they extend behind the front corner posts.A fiberboard insert having vertical dividers for lateral filing is removably installed between rigid shelves by moving dividers on opposite ends of the insert into locking positions behind the corner posts of the shelf unit after the insert has been placed between rigid shelves.

Abstract: A tote box having a rigid reinforcing rim extending around its top periphery is provided with a removable lid which is secured in place by a rigid locking tongue biased into locking engagement with an exposed locking segment of the reinforcing rim. The lid is also preferably strengthened by a rigid rim to which the locking tongue is affixed. Downwardly depending side panels on the lid are folded to define pockets within which the lid rim is contained, and corner retention bar members on the lid rim are engaged under exposed corner segments of the box reinforcing rim to cooperate with the locking tongue in holding the lid securely locked in place.

Abstract: A portable, open top, mail collecting container constructed and shaped from lightweight material for removable insertion inside of a mail collection box through the box access door. The upper edges of the container incline downwardly from the rear end wall towards the front end wall to facilitate insertion in and removal through the restricted access opening in the side of a mailbox. A moisture impervious bottom wall on the container is provided with liquid drainage apertures and is supported on vertically extending projections to permit any liquid which might fall into the container to drain through the bottom and to protect mail collected in the container from exposure to moisture when the container is rested on the ground in the course of handling.