I came across 5 of these at prices I never thought I'd see again, so I bought 'em all.
Each one contains the very nice Corvair/Chrysler Firepower Hemi engine parts-pack tree, the equally nice SBC Chevy/Pontiac engine parts-pack tree, plus the chrome bumpers-and-grilles tree...and one of 'em had an extra Chevy/Poncho tree.
Snagged one of these too, at a low low price. This is exactly the same kit that comes in the pretty box.