I believe the Wheel Paint being Body Colored was related to the Two-Piece dog-dish style hub-cap/trim ring vs the one-piece hub-cap used starting in December 1967.
Since a handful of 280's were built in nov/dec 1967, there is a chance some 280's were built with two piece hub-caps and hence would most-likely have painted wheels.
Also, since some 250's were built in late December 1967, there might be some 250's with the one-piece hub-caps.
two piece hub caps = color painted wheels
one piece hub cap = no body color on wheels
Aficionados - please correct if my comments are not accurate !!!