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'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's current biometric information is equivalent to the user's current biometric information, a retrieval devices provides the package to the user.