Tell HN: It's quite simple to deceive someone on Facebook Marketplace

I recently purchased a Herman Miller chair on Facebook Marketplace and, like anyone, was closely monitoring the UPS site to track my package. Everything seemed fine until I noticed that, while in transit, the seller instructed UPS to return the package to them. Now, I'm facing an issue where Facebook doesn't allow me to file a claim. Every attempt results in the same response: "The seller has already shipped your package." I was surprised at how easily one can be scammed on Facebook Marketplace with such an obvious trick.