a method of obtaining a package is described . a user is electronically notified that a package has arrived at a predetermined location . the user then prints a paper receipt including a two - dimensional bar code encoding the user &# 39 ; s previously provided biometric information . at the predetermined location , the user scans the two - dimensional bar code , which is decoded to obtain the previously provided biometric information . the user also conveys current biometric information . if the user &# 39 ; s current biometric information is equivalent to the user &# 39 ; s current biometric information , a retrieval devices provides the package to the user .