I think the most important action by a seller is to go to the post office when shipping out any item and request "Scan for Acceptance" to the postal clerk. Most postal clerks will comply, but some will object by saying just put it over there. According the the Postal Authorities, the postal clerk must scan as requested and offer a receipt after scanning the bar codes. This is for your protection and the ability to transfer funds to your bank account. Unfortunately some sellers are not aware of this procedure and buyer is in a quandary if the item has been shipped. Of course this is no guaranty that there would be proper shipping information on USPS website, but the information will show "Scan for Acceptance" will appear in the information. This way you know the item was delivered to the post office.