USPS.com® - USPS Tracking®
tools.usps.comService / Sample Number. USPS Tracking ® 9400 1000 0000 0000 0000 00. Priority Mail ® 9205 5000 0000 0000 0000 00. Certified Mail ® 9407 3000 0000 0000 0000 00. Collect On Delivery Hold For Pickup 9303 3000 0000 0000 0000 00. Global Express Guaranteed ® 82 000 000 00