The builtwith.com tool identifies the uspost.shop website to be hosted with shopify.com You can report them directly to Shopify using this link: https://www.shopify.com/legal/report-aup-violation Other searching shows that Etsy and Ebay have ongoing issues with counterfeit stamps not only in the US but also the UK and Canada. https://community.etsy.com/t5/All-About-Shipping/Fake-Forever-stamps/td-p/136228765
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