When I order a bag of beans... and let's say they were roasted on 12/1. Then let's say I get them in the mail 12/3. Do those 2 days count as the beans resting if they are in a vacuum sealed bagged (albeit with some air)?

I count them as "resting" as they are off gassing, thus the 1-way valve.

Why wouldn't those days count? Even if coffee beans are frozen, they still age, albeit much more slowly. See Frozen Coffee Storage Calculator for more details.

As soon as they leave the roast chamber they are "resting." Vacuum sealing prevents oxidation but not off gassing of CO2.