Call Ebay directly on this one. Using a forwarding service should
invalidate buyer protection.
https://www.ebay.com/help/policies/ebay-money-back-guarantee-policy/ebay-money-back-guarantee-policy?id=4210
I've had luck with an actual CS rep.
I put mine right in the listing itself in large letters as well as in
the shipping info (I work a full time job so usually can't ship same
day). And yet if it's not shipped in a few hours, some people are
sending messages.