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#11
The MS guy is basically talking rubbish or you have misinterpreted what he is saying.
It may be true the drive may not get updated to latest build due to being old stock but that does not mean all usb drives are using original version.
Also what is true is even if you get latest build on iso or download from MS, it will install 16299.15 and then autoupdate to (currently) 16299.125.