There apparently is no oversight with Mercari. According to the site, the seller has three days to respond/ship the item. I know it has only been seven days at this point, but the seller, daniel son, has not made any attempt at all to respond to my two messages. And he is rated as a reliable, quick shipper! If the item looks too good to be true, turn and run. Go back to Ebay or Etsy.
Hi Jean,
Please note that if your seller does not ship an item within their three day timeframe, you can choose to cancel your order and be refunded in your original payment method. Don't worry, your money is in safe hands. We don't release payment until we confirm the item has been delivered to you.
We're always here to help! Please don't hesitate to reach out to our Support Team via the in-app Help Center or email contact@mercari.com anytime with any questions or concerns.
Thank you for your understanding.
Best Regards,
Team Mercari