There is a quite scarce Western Super-X 10-gauge, 2 7/8-inch, RECORD, Lubaloy Shot box for sale on ebay --
https://www.ebay.com/itm/13420238593...Bk9SR4CNwZfYYA
The Western Cartridge Co. dropped the Super-10 Lubaloy loads at the end of 1936. In the December 24, 1936, price list the 10-gauge, 2 7/8-inch, Lubaloy loads, P14L, has an * next to it indicating "Discontinued loads offered subject to stock on hand."
SUPER-X Lubaloy Loads, December 24, 1936.jpeg