The U.S. Postal Utility, previously the Display Labour Branch, has a guideline colour scheme of carmine, achromic and depressed in 2011. These colours are most recognized on the USPS's organization boxes, which are on street corners throughout the community. But, the colour scheme for these boxes has been far from consistent; it changed various times before fitting the colour it is nowadays.
1889
The colour of aggregation boxes from their dawn in the 1850s is distant. The earliest reference to assemblage box colour is construct in a job by W.B. Jones in 1889, "The Description of the Publicize Employment." It refers to 800 street packages boxes painted either carmine or callow; the chestnut ones are listed as the most valuable. It's unclear if that reference applied to all organization boxes, or just to those in Boston, where the author lived.
1903
In 1903, Assistant Postmaster General, J.On July 4, 1955, Postmaster General Arthur Summerfield declared that collection boxes would be painted red, white, and blue to make them easily recognizable. The paints were of a new, longer-lasting formula.
Post-1971
The Post Office Department was reorganized in 1971 as the U.S. This reference suggests that there was no standard color for collection boxes, and that it had changed according to the whims of administrators.1917 to 1955
Before World War I, the color of collection boxes changed repeatedly. After the war, the War Department gave the Post Office Department a large supply of surplus olive drab paint that was used to coat the collection boxes. Olive drab became the standard color for collection boxes until 1955.
1955 to 1971
Bristow wrote to General Superintendent of the Free-Delivery System, A.W. Machen and referred to the repeated change of collection box colors. He mentioned that "years ago" the color had been dark green, then it was vermilion red, then an aluminum color, then green, then aluminum bronze.
Postal Service. At that time, collection boxes were painted a solid, deep blue color. The boxes were given decals with images of the new Postal Service logo. This color scheme was still in effect in 2011, although in 1993 a new logo appeared.