Rus is correct that a Ditzler bulletin in July 1953 listed Cadet Gray, so it's certainly possible that it was used into the '54 model year which began that month. It's a lighter gray, similar to the photo Rus posted here. Alan, it would be useful to see a photo of your toolbox lid, and also to know the serial number of your 3B in order to determine if it's an early '54.
Derek
P.S. Very annoying that the blank post glitch continues, and unfortunately Alan's posts are blank for me when I'm signed in to the forum, so I have to log out to see them. Is this also continuing for you, Rus?