One of the most frequent questions of buyers: Has my item been shipped?  One of the best ways to answer.  Yes, your Delivery confirmation number is....The added fifty or sixty cents for USPS Delivery confimation is well worth it..Delivery confirmation allows both buyer and seller to view shipping status.  This added protection lets the buyer know the item has been shipped and when.  This also allows the seller to know when item was delivered.  If you are using first class or priority mail, delivery confirmation can be used.  The main guidline is the package has to be two- thirds  of  an inch thick.This can be done using cost effective shipping  foam.  Delivery confirmation  is a cheap and easy way to keep your sellers happy and informed.