We’ve been using Refund Retriever for a few years now, and we’re very happy with their service. They basically audit all of our shipments, and request refunds from UPS and Fedex when they discover a late shipment. These are refunds we never would have requested on our own, so it’s a huge benefit to our company. And we only pay them a percentage of the fees that get refunded, so if they are not able process any refunds on your behalf, we owe them nothing. Highly recommended, all ecommerce companies should use this service!