Has Anyone Seen High Value Jubilees On Cover?

I'm trying to get all the 1897 Jubilees on cover - probably impossible but still trying. I have them all up to the 15 cent. Was wondering if anyone has or has seen the higher values. I saw them all in an exhibit (Brigham collection I think). Some were obviously philatelic covers. The 50 cent and higher values were mainly used on mailing labels for bulk shipments (I think) and were often roller cancelled. I recently bid on a $2 Jubilee used this way but didn't win it.

Hard to get, I would think considering there were few sold in the Brigham Sale of Late Victorian Issues. You can see the catalog on the Brigham site:

http://brighamauctions.com/past-sales/

Hammer in CDN$:

Lot Hammer Denom
=================
257 2,645 - $1
258 1,150 - $1
259 2,070 - $2
260 2,300 - $3
261 2,415 - $4
262 2,530 - $5