Ah, thanks man! I was planning on doing this one myself sometime.
I had already collected several pictures (from ebay auctions), but the ones I collected show some extra black lines (or edges):


I guess there are different versions of this CPO.
The clearest image I could find of that little blue box is this one:

I guess it's a serial number or maybe a date (looks like 31-02-2002-8 or something) Personally I guess I'd take it out.