Bob
I don't think you are seeing the results of progressive evolution in design of this box. Rather just the variations in concurrent production across a number of manufacturers in Canada, England and the USA. I have seen the two variations you have noted, as well as a snap fit lid style and a luggage clasp style. A similar variation also occurs with the Spare Parts Box.
I have only ever seen the two variations in tube packing you have mentioned and both are displayed on the cloth padding in side the lid. Some makers used strips of black 'roofing felt' wrapped around the valves, in two different patterns and at least one other manufacturer used felt cloth 'booties' on each individual valve.
David
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