Clark,
I really hope you can find the "Evidence received from the Bureau of Accounting", but I'm not going to hold my breath!
I hope everyone appreciates the intensive search you have conducted so far. Digging out the Armor Volume 13 with its bit of information is an excellent contribution. It is quite interesting to note that the 1909 RIA Museum catalog lists those two .30 Lugers as "TWO
REVOLVERS, AUTOMATIC LUGER, CAL. .30"!
P.S. The only two Test Lugers currently in the Springfield Armory Museum listing are 7018 and 6885.