Here is one reference I have found to such a box:

The Confederate soldier who marched to war in 1861 expected to live rather well while in the service. As explained by artilleryman Carlton McCarthy in his Detailed Minutiae of Soldier Life in the Army of Northern Virginia, at the start of the war the equipment of the typical company was generous to a fault:

...each mess, generally composed of from five to ten men...had its outfit, consisting of a large camp chest containing skillet, frying pan, coffee boiler, bucket for lard, coffee box, salt box, sugar box, meal box, flour box, knives, forks, spoons, plates, cups, etc. etc. These chests were so large that eight or ten of them filled up an army wagon...In addition to the chest each mess owned an axe, water bucket, and bread tray. Then the tents of each company, and little sheet iron stoves, and stove pipe, and the trunks and valises of the company officers...so that each company had a small wagon train of their own.
The soldiers' expectations of camp life were further molded by such works as John P. Curry's Volunteers' Camp and Field Book (Richmond, 1862), which promised that each company would be staffed with,