I checked my records and the engine I have is 30-1500-1, a RailKing Imperial delivered in December 2008 according to the MTH website.
I repainted it into a Seaboard engine and later modified to BPRC. It's one of the best, slow-speed engines I have.
It's odd (to me) that the manual doesn't have a parts breakdown, even my RK 2-8-0 manual has the breakdown but not this 0-6-0.