Surely we've had FReepers comment on those marks?? They look like something that a clerk might make in checking the document. But to have them appear on such a blatant forgery as the "white" BC shown above is a good question. Perhaps a clerk made them on many BC's including the particular BC the forger used as his template, and he simply left them in.
I call the "white" BC a hoax because not only do the typewritten characters not line up vertically, they don't even line up horizontally. It is a really clutzed up cut-n-paste job IMHO. Still, those little marks are interesting.