I had heard about the box bracket story which is not cool. I think you're right on the box being restamped - but it is possible that D-R did it. If you've ever visited
https://delcoremyperformanceignitionsystems.net/, the 1115345 box that he owns also has had the last digit restamped, although his might be an engineering testing unit. Makes me wonder if they started recycling boxes to make the RAV unit if they had a lot of the over the counter retrofit kits gathering dust. The coil pictured with his $4,000.00 package is a #296 which has the correct appearance, but is not the correct #406. It's unknown if it has the same electrical characteristics, but I would suspect not. He also has the decal installed upside down.
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Hoping to finish a project while I'm still able to push the clutch in....
1963 Tempest Convertible (Ram Air IV w/4” stroke), TKX, 9-inch w/3.70 gears and triangulated 4-link)
Pictures