I have 2 Windows 10 licenses in my Microsoft account that are "floating". One was used on a box I built for my father-in-law which got literally destroyed, and the second one was liberated from a workstation last year (see here). I can find the purchase dates and order numbers easily in my Microsoft account, but I can find no way to get a product key for either license to re-use it.
How do I go about getting a product key in this case? The emails are long, long gone. Microsoft's 877 help line is remarkably useless in this context.
