The Copper thing was never actually true. When Intrawest was dumping Copper, Someone at Vail might have said it would be nice, but nothing was even remotely looked into. This is the reason they don't outright own A-basin though.. cause it would be a monopoly.
They were only ever rumors and it is no longer relevant at all because Powdr has absolutely zero intention of selling Copper in the next 30 years.
Breck received that much in locations, but the snowstake at Breck has been moved to a more favorable location and the storm was loading on west facing slopes and with the wind... hense the high reading. Probably wasn't an average, but it just so happened that that particular storm was great for the location of the new snow stake.
CPFC wrote quite a bit on this since people in Breck were only reporting around a foot at their homes and what not.
And yes, I was there with you, it was snowing really really hard, but just as much at Copper/Frisco. In town the amounts were pretty Identical. But copper is mostly north facing and Breck is west facing.. So yeah, same snow fell on both peaks, but the wind/direction favored Breck.