I am just guessing wildly here.
In the Elkhart area where the PC factory is located, many RV companies went out of business in 2008 with their stock sold at auctions. I know Kermit bought a bunch of 2008 Sprinter chassis then, and offered those rigs at the same discount he got, to make great offers during very hard RV times.
Maybe Kermit bought more product at auction, not just chassis. Maybe ovens, fridges, TVs, who knows?
But it really should not matter. The appliance manufacture should honor the warranty regardless of when it was made. It is based on when it got sold to the consumer. The same applies to those Sprinter chassis.
Walmart, Sears, Target, Carsons, Ford, GM, it doesn't matter when the product was manufactured and how long it was stored in a warehouse, the warranty begins when the consumer buys it.