If you own a 2011 or 2012 PC Sprinter, it could be built on a 2010 Sprinter chassis. If that be your situation, you might lack the spare because of how Phoenix bought those Sprinters at a bankruptcy auction. Maybe some lacked a spare tire.
Our chassis is 2011 vintage. And, maybe we should move this conversation out of the "Introduce Yourself" thread and into the General Discussion or Tips and Tricks. . .just sayin".