I am a tin food can/bailing wire coffee boiler advocate, personally. Simpler the better. I think it would be difficult to find surviving documentation on an item which was not issued? This is a question because these things are found dug, as I don't know of the paper trail for the individual piece of the mess kit called a "mucket." In period descriptons from the Civil War, what we know as a mucket seem to be most often referred to as "coffee boilers." Men describe a cup with a hinged lid. The term however obscure in origin, was in use at the time although probably not widely in use. This was this from a post on the AC forum from about six years ago.
...from the letters of Oliver Wilcox Norton Yorktown, VA, April 12, 1862:
"I was sitting by the fire with several others making coffee. Each of us has a small tin kettle holding three pints or so, fitted with a tight cover. We call them muckets for want of a better name. By the way, I believe almost any of us would throw away a blanket before he would his mucket, they are so indispensable. The cover of one was crowded down so tight that there was no room for the steam to escape. It swallowed the indignity with commendable patience for a time, but finally it lost all self control and exploded, throwing hot coffee in all directions, but particularly in the direction of my left foot. It was not very badly scalded, and I hope will be well in a few days."