Upload & Sell: On
They will become highly valued collectors pieces like the old Olympics caps.
Actually, there are some old Canon caps which are rather difficult to get today in a nice condition. They have the same raised lettering "Canon" on them, but not silvered, i.e., the entire cap is black.
The old classics such as the Pipe, 50 f/1.0 and 135 SF came with such caps. Then, sometime in early to mid nineties, Canon introduced the silver lettering on their caps as well as "ultrasonic" addition (where it applied).