Invoice for Branded Products

Hi

I have a order confirmation from The Perfume Shop and they no longer include invoices online or with the item delivered. How do I provide the branded Products (Hugo Boss, Gucci) aftershaves are genuine I have included the order confirmation and Amazon want a Invoice. I even included the link to the FAQ’s where the perfumeshop state they no longer provide invoices still no help

Can anybody assist or point me in the right direction.

Thank You