Knowing that in a recent past, somebody had smuggled out for many years numerous special number out from the BoC, I would not be surprised that this serie of low-numbered was made available via a not-very-legal-way....
Its already quite improbable to catch fresh out from bricks any low-numbered notes (under 1000), imagine just catch the "0000000". I have much difficulties to believe that it's happened by an error. This note needed some help to get out...