Etsy Etsy Erroneously Closed a Case and I am out $1,500. 117 Adams St NY

I ordered a ring through Etsy for $1,450. That Etsy ordered was never delivered/received. I opened a case with Etsy. The seller provided delivery "confirmation" did not include a signature (which was required by the seller) and there was a picture but that picture didn't show any apartment number. Etsy did not reach out to me but simply closed the case as "delivered." I reached out to DHL myself, explained what happened and received confirmation (in writing) that DHL deemed the package as lost.

DHL then informed me that only the seller could file an insurance claim. Because Etsy closed the case - the seller is not responding to me and refusing to file a claim, replace the ring and/or refund my money. I have asked Etsy to reopen the claim to put pressure on them. They told me are unwilling to reopen the claim and I should deal with this through PayPal - which I am.

The reality of this is - Etsy erroneously closed the claim, therefore, laying the foundation for their seller to refusing to help me. It would be quite simple for them to reopen it - it costs them nothing and helps their customer.