This would explain why the documents have header and seal labled REPUBLIC OF KENYA, even though the main country of kenya didn't consider itself a republic and didn't refer to itself this way when the document was issued. BP's finding give a big boost to the chance the document could be real.
This is the crux of the matter. The BC will be either authenticated or invalidated when another Kenyan BC from that disputed coastal strip from the Dec 1963-Dec 1964 Dominion interregnum is produced.
If the printed blank is the same, then the document is real. But if that coastal strip used a different blank, then it is an artful fraud.