Supply chain invoices establish the route the goods have travelled from the manufacturer to you through wholesalers/distributors and through you on to the customer. Without all the links through reputable wholesalers/distributors Amazon cannot guarantee the authenticity of the goods and will use the term counterfeit to describe them until/unless supply chain is proven. It doesn't mean the goods are necessarily fake, it means Amazon cannot prove they are not, so will not allow them to be sold on their platform.

Items sold through retailers are being sold to the end user rather than to a reseller (much as you sell to customers on Amazon). Retailers are often reluctant to reveal their suppliers to prevent competitors getting the same/better deal than them so won't supply upstream invoices. Wholesalers/distributors usually have exclusive rights to the brand in a certain market so have no issue providing a supply invoice with redacted prices to confirm the good supplied were authentic. Someone who has bought retail also cannot resell the goods as new as they are unable to underwrite guarantees/warranties as they have no direct relationship with the brand.

If Amazon is asking for these it is often in response to a customer complaint or review that mentions the goods maybe inauthentic. Without supply chain invoices you'll eventually have to accept the violation and hope Amazon allows you to keep trading on the Amazon platform.