Customer service/support often lies like a rug. Anyway, what happens with a
reinstall when the installed key is used, or conversely when the sticker key
is used might be interesting. (Assuming you can even do a reinstall with
what was furnished.) In reality, even with a global OEM image install, the
key should have been changed to match the sticker key. At the same time, you
should remember that such keys exist, and can be quite useful under specific
circumstances. For instance a corporate purchase might have the same key for
all systems bought under that purchase order, or even be changed by the
corporate IT department to a corporate key before the systems go into
service.
A fly in the otherwise murky ointment is that the OEM has virtually all
support responsibility, not Microsoft. This allows Microsoft to sell the
software at a bigger discount to volume OEMs, and helps to avoid lawsuits
based upon wholesale selling prices and availability. At one time, the
windows "update" scheme was planned to go to the OEM's site instead of
Microsoft. One of my older HP laptops did this, until it was changed to
comply with