Today from the COVID lot - I found them!
When going through the 2012-13 O Pee Chee cards, there was a couple sections where cards were missing in action. One was the rookie subset, which I expect is actually not here as they were likely pulled.
The second, a run between around card 130-180 in the base set, all of which are here today for your viewing pleasure. Getting this run now puts my base set completion on this one to over 83% from basically zero beforehand.
My guess is I won't see more than one or two other base cards from this set but being less than 100 left on the 600 card set is a great start to me. I'll have to take a look at the rookie class more closely, and the related prices, to see if I go with a 550 card pure base set, or work on the 50 card rookie subset as well.