While I cannot confirm that it was hand-made, there is reasonable doubt that it is authentic. In particular, this prefix (BFK) was widely available in uncut sheets meaning that anyone with a pair of scissors or even a ruler could make some kind of cutting "error".
The auction on eBay that you originally referred to has been updated to include the following:
PLEASE READ THE FOLLOWING BEFORE BIDDING...
PLEASE NOTE I HAVE RECEIVED INFORMATION REGARDING THIS NOTE.IT APPEARS THIS PREFIX WAS RELEASED AS SHEETS OF NOTES RATHER THAN INDIVIDUALLY.IT IS POSSIBLE THAT THIS IS NOT A PRODUCTION ERROR OCCURING DURING PRINTING BUT RATHER IT IS POSSIBLY MAN MADE.MANY THANKS TO THE CANADIAN COLLECTORS WHO HAVE POINTED THIS OUT.I AM UNABLE TO ALTER THE ABOVE TITLE OR DESCRIPTION DUE TO THERE BEING A BID ON THE ITEM.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.