Marc and Jim,
I have read this thread with great interest. Marc, you have shared some very useful information. I hope that I am able to share something that aids you in your research as well:

Pennsylvania Governor A.G. Curtin wrote to Sec. of War Simon Cameron, on Sept. 18, 1861:

“The 4,000 muskets have arrived. They are Prussian guns made in 1823, altered, second-hand, in all respects inferior; much heavier than our muskets; of different caliber." (The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies .Series III, Vol. I, p. 526)

Cameron's Assistant, Thomas Scott, turned around six days later and offered these to Indiana's Governor Morton:

“We can send you 4,000 foreign muskets of medium quality. Shall it be done? Answer immediately.” (ibid., p. 536)

Later that day, Scott wrote to Morton again,

“I have just learned that the 4,000 Prussian muskets intended for you as telegraphed this morning were forwarded yesterday to General Anderson at Louisville. " (ibid, p.536)

Gov. Morton was busy writing letters on September 225:
IN Gov. Morton to Asst. Sec of War Scott, Sept. 25, 1861

“I have a half-dozen regiments ready to move and not a gun for them. The last one sent to Anderson be [sic] armed with flintlock muskets. The recruiting business in Indiana will stop if guns are not furnished. Sending regiments out of the State unarmed deters men from entering the service. They are sent into the field before having learned how to handle their guns. Why not send the guns here? They go into the service anyhow. Governor Dennison told me last night the Government promised him at once 5,000 rifles, and there are now 6,000 rifle muskets in arsenal in Cincinnati. I have heard nothing of Wood’s appointment. My State has done well; stripped herself of arms for the Government, and the war is now upon her border. If I have done anything the Government don’t like, charge it to me and do not let the State suffer. I wish this shown to the President." (ibid. p. 539)

Apparently, Indiana was too impressed with the weapons they were receiving early in the war. This eearly period of purchases and issues can provide for some interesting drama!

Hope that you find this material useful,
John A-G
Iola, Wisconsin