Cardboard Packaging Supplies

I need to know how to calculate the savings for the change to a smaller size.

It will be difficult to find. You might ask the companies, but they rarely make such information public. The best advice I can give you is just making an assumption based on the cost of cardboard used to manufacture the boxes, you should be able to find a carton prices using an Internet search

Ask Walmart. They are known to have companies sell reduced packaging businesses so they can deceive the public into the idea that they get lower prices.

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Request an annual report and begin research on their spending.

Abput 10k a year