Since this note is not in the catalogue, it is very likely that BCS will not certify it. At least you have to tell them ahead of time what you have. If you just show up at their doorstep with this note in hand, even if you have an appointment, they may not be willing to stake their reputation on authenticating and grading this note. You could get an informal opinion, for sure, but they may not want to slab it.
I think the person who would be the best to see this note is the catalogue editor. From there, getting an article (or even just a picture) published in the CPMS Journal would go a long way to getting information about this note distributed publicly.