One Cartridge not a Box: 8 Gauge Red Paper Shotshell, By Winchester, Older Red Paper Case, with head to find “WINCHESTER SUPER-X No 8 INDUSTRIAL” Head -Stamp.
These cases were loaded by Winchester to ship samples of gunpowder to avoid paying a hazmat fee, as loaded cartridges are not considered hazmat material, however shipping just gunpowder is considered hazmat material.
Sold only as a display or collectible. NOT FOR SHOOTING IN A FIREARM!  Not 100% mint, minor nicks., some have minor wax spots.

A short story on shot-shells:
Shot-Shells have been produced for over 2 centuries in many sizes, from 00 gauge to .360 gauge  and also in millimeters sizes.
For those not familiar with shot-shells the lower the gauge number the larger the size. A 20 gauge is smaller then a 16 gauge, a 16 gauge is smaller then a 12 gauge etc.
A gauge is a unit of measurement in shotguns, determined by the number of lead balls the size of the gun's bore (inside barrel diameter) that can be produced out of a pound of lead.  A 20 gauge gun size has 20 balls per pound, a 12 gauge has 12 balls, hence the smaller the gauge number the large the bore or size of the shell.