Mark,
I was talking to Gilles last week on this very topic.
It appears that eventhough the 2005 $10 Jenkins-Dodge, BEY (3.645M - 3.735M) is the highest range
of BEY inserts, they were the first BEY inserts to be used and were primarily seen in BEY bricks in the
4M to 5M ranges, and then only in very small quantities. Those BEY bricks haven't been seen for
sometime, so it is unlikely any more will be found in UNC.
...Arthur
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Arthur Richards
Contributor, Charlton Catalogue of Canadian Government Paper Money, 19th, 20th, 21st, 22nd and 29th Edition
Pricing Panel Member, Charlton Catalogue of Canadian Government Paper Money, 21st Edition 2009