They use FedEx. When the package continued to linger days past the delivery date, it could not be tracked because it was a FedEx SmartPost shipment. Only the company (Woman Within) who shipped the package can file a claim on it, and the claim cannot be submitted online. As the shipper, they need to refer to filing instructions at fedex.com/us/smartpostguide. If you call Dallas and speak to a Woman Within customer service rep or supervisor who will tell you they are not "allowed" to check on your package, translate, "we can't be bothered." This is both a FedEx and Woman Within issue. Each by themselves is incompetent. In addition, this seller is sketchy. Either way, you wind up with a package never received. Buyer beware.