Adam,
I found this scorecard in a drawer at the OGA. I only mentioned the WAG remembering that Banff had a course map and looked at it to make the comparison.
Assuming the scorecard map is correct, now the bunkers are smaller. Some movement of the fairway bunkers on two moving toward the green, bunkers on th left of 3 fairway are much smaller as they extended to 16, bunkering on 6 no longer as punishing short right, long left.
Filled in the bunker short right of 9 and the fronting/left bunker on 10. The 2nd shot carry bunker on 11 is now in the second shot landing zone. Bunkers missing between 15 and 16 greens and the Bow river, but that is very understandable with erosion. Some of the bunkering left of 17 and 18 is gone.
From the size and number of bunkers I would assume the soil was borrowed for raised green complexes, but I may be wrong, again.