It's not really "Chase" offering the benefits, it's Visa or Mastercard, so I'll take the liberty of changing the title.
Bought 2 items at a store in Kansas, one on AMEX, one on Chase MC.
Did return protection on AMEX without a hitch. Did return protection on Chase MC and they called the store and the store agreed to do a refund for me next time I'm in Kansas, so Chase MC denied the claim.