But The Main Purpose of The Lockbox is That it Facilitates the Sale of the Home , Without it , Selling or Buying a Home would be much more difficult . Think of The Alternatives: Without a Lockbox , The Seller would have to be present when the buyer came by with their agent , and that not really help to sell the home , Seller's could leave the door unlocked , of course , but in today's security - conscious worl,That is not a great idea . One possibility that the seller could give a Key to their Listing agent , But then the listing agent would always have to be present when another brouth a buyer to the home, Showing would have to be scheduled tightly and that would be an inconvenience to the Listing Agent and the Buyer's Agent ............and it woul be an inconvenience to the Buyer ,Good Luck! Atte : Sandra Cotes - Fri Dec 4, 2009