That's amazing! I wonder why I haven't seen anything about this before if 600 were produced. Do you think they are in storage in some Indiana Jones-style warehouse? Maybe they were all destroyed when they upgraded.
Most likely still sitting in storage (at least on Ft. Benning where I was). These would have been located at only 4 sites that operate as U.S. Army Basic Training units - Ft. Benning, Ft. Leonard Wood, Ft. Jackson, and Ft. Knox.
Ft. Knox has shut down their Basic Training and merged it with Ft. Benning in recent years. I imagine a box was thrown out with the trash...talk about sitting on gold! =/