Well, let's talk about date made (as opposed to date shipped ) for a moment.
We've had it beaten into our heads since forever that the date made is not available/unknown/can't be known/etc., so forget about it!!
That very clearly ain't so! What is most certainly so is, while (almost) all shipping dates are known---and easily/quickly accessed, that doesn't apply to completion dates. If you're looking for secret stuff known only to a privileged few, this ain't it either----this is just plain, everyday common sense! (And it's backed up by first hand experiences where "made" dates have been provided to me----in writing---AND over the phone.) Common sense says when you're given a "made" date over the phone, that information is INSTANTLY available to your benefactor---never mind your benefactor is a walking encyclopedia---which, of course, is why you called him in the first place!
Now for some more common sense: While most shipping dates are readily available, the same very likely does not apply most completion dates. The letter writing folks have a BIG job---considering only the sheer number of letters they crank out---and the fact that every now and again they get behind---and WAY behind---never mind how streamlined their process might be. Now consider that while some completion dates are clearly known (and readily accessible), it stands to reason a goodly number are not---either not readily available, or not available at all---and they may very well not know which is which---quickly---and quickly is the name of the game!
I think I've said enough to make my point---that while shipping dates are almost always readily available, completion dates are not----or are for some stuff, but not for other stuff---and you AND the letter folks both need to have things quickly, conveniently, and accurately, rather than sometime and if it can be found.
Ralph Tremaine
In other words, all this is about what's practical instead of what's possible.