I think Ray is correct that this was a box that for some reason had only 1140 rounds instead of the normal 1500.
All sorts of explanations are possible-
–ammo returned after partial use in training
–some bandoleers found to be damaged and removed
– some removed in order to give the 1140 number needed to fill a requisition [e.g.- x number of rounds per person authorized for training times number of people in unit = 1140 or 1140 in addition to one or more crates o 1500 rounds.
Note that this is the circa 1945 style crate with natural wood finish and black stenciling.
The previous style was a brown painted crate with yellow stencils.
Before that, they used a brown crate with ammo type stripe (red ball, blue and yellow for AP, etc) and yellow stencils.
This is the M1917 crate used for small arms ammunition of nearly all calibers (.30-06, shotgun, .50 BMG and others)
Several other types were also used for .30-06 as well as other calibers.
These crates lasted until circa late 1945 when the use of “spam cans” began and several spam cans would be placed in a crate specifically sized for the caliber and type of packing (e.g.- .30-06 in cartons or bandoleers, etc)
The spam cans and wooden crates were replaced by use of the metal “ammo cans” in .30 or .50 caliber size, packed four or two respectively in a lightweight wire bound covering.
Some sick people collect these, although therapy may help, but I have not tried it yet.