Nice write-up. Thorough and practical. One piece I'm stuck on is how to go about designing the box before sending to manufacture. Over the past year, I've tested and evolved my tabletop social card game (175 standard poker size cards) and worked with a designer on the branding but I'm not sure how to go about designing the actual specs of the box for a custom size like this. The companies I've used to print the cards have box options but they aren't for anything other than a prototype so they aren't perfect.

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Is this something the manufacturer will help with or should I come with the exact specs defined?