As you may have learned from the IAA Headstamp Guide, your cases were probably originally loaded by the Triton Cartridge Corporation, P. O. Box 50, 2 Briar Lane, Wappingers Falls, New York 12590. I can’t say who actually manufactured the cases, but another member will most-likely post that info. One issue you might have is that those cases are Boxer-primed and easily reloadable. Do you have samples of the bullets that were used, or better, unfired cartridges? That might help determine if they are original examples from Triton or reloads using Triton cases.