Ups Tracking Without Tracking Number. Is a tag left by a UPS driver after delivery has been attempted. Tracking USPS Packages with Informed Delivery.

Pickup notifications for LTL. When creating a shipment you can assign a reference like a purchase order number or customer number up to 35 characters to help track shipments without entering tracking numbers. Tracking USPS Packages with Informed Delivery.
The Tracking API lets your customers track shipments right from your website using your reference or order number allowing you to offer end-to-end customer service.
If your parcelss dont have access to a tracking number you can track your shipments online with main tracking page by the reference number assigned to your shipment and USPS will be able to locate your parcels when you select the track button. Tracking USPS Packages with Informed Delivery. In the Orders section you can find the shipping information and customize the parcel management. This account provides you with a dashboard and tools for locating your parcel.