where do i go in the store to return an amazon purchase

Go directly to the customer service counter and they will take and package for you

The Amazon-owned grocery store will now handle your returns free of charge. Before heading out for your grocery run, start your return on Amazon's Online Return Center. Choose your local Whole Foods Market (not all items or ZIP codes may be eligible for returns for now), then get your QR code ready from your email.

Whole food markets