A secure locker box including a central processing lock system for locking said secure locker box, said central processing lock system including a processing unit, an electro mechanical lock for locking and unlocking a door of the secure locker box, a contactless communication module, an active communication module, a proximity sensors system, enabling automatic identification of a package in said secure locker box via a RFID reader, and an energy harvesting and storage system and an external power supply for electrical energy supply, wherein said central processing lock system is adapted to receive a wakeup signal via said contactless communication module, wherein said wakeup signal is sent by a mobile user device of a courier and / or a user; send a request for opening said electro mechanical lock; in response to receiving an unlock confirmation message, open said electro mechanical lock; recognize closing of said electro mechanical lock and in response sending a door lock confirmation message; wherein said secure locker box is adapted to communicate with the mobile user device using said contactless communication module, and wherein said request for opening, said unlock confirmation message, and said door lock confirmation message is transmitted and/or received and/or forwarded by said mobile user device towards/from a remote locker box center, wherein said mobile user device comprises an acoustic assembly, which includes a speaker and a microphone of said mobile user device, enabling Data Over Voice communication with said secure locker box; wherein said active communication module transmits and/or receives said request for opening, said unlock confirmation message, and said door lock confirmation message towards/from a remote locker box center; wherein said contactless communication module comprises a Smart Optical Tag, enabling two-way communication using camera and flash of said mobile user device, wherein said contactless communication module comprises a microphone, which enables reception of a sound token, which is generated in the mobile user device of the courier and / or the user. a central processing lock system for locking said secure locker box, said central processing lock system including a processing unit, an electro mechanical lock for locking and unlocking a door of the secure locker box, a contactless communication module, an active communication module, a proximity sensors system, enabling automatic identification of a package in said secure locker box via a RFID reader, and an energy harvesting and storage system and an external power supply for electrical energy supply, wherein said central processing lock system is adapted to receive a wakeup signal via said contactless communication module, wherein said wakeup signal is sent by a mobile user device of a courier and / or a user; send a request for opening said electro mechanical lock; in response to receiving an unlock confirmation message, open said electro mechanical lock; recognize closing of said electro mechanical lock and in response sending a door lock confirmation message; receive a wakeup signal via said contactless communication module, wherein said wakeup signal is sent by a mobile user device of a courier and / or a user; send a request for opening said electro mechanical lock; in response to receiving an unlock confirmation message, open said electro mechanical lock; recognize closing of said electro mechanical lock and in response sending a door lock confirmation message; wherein said secure locker box is adapted to communicate with the mobile user device using said contactless communication module, and wherein said request for opening, said unlock confirmation message, and said door lock confirmation message is transmitted and/or received and/or forwarded by said mobile user device towards/from a remote locker box center, wherein said mobile user device comprises an acoustic assembly, which includes a speaker and a microphone of said mobile user device, enabling Data Over Voice communication with said secure locker box; wherein said active communication module transmits and/or receives said request for opening, said unlock confirmation message, and said door lock confirmation message towards/from a remote locker box center; wherein said contactless communication module comprises a Smart Optical Tag, enabling two-way communication using camera and flash of said mobile user device, wherein said contactless communication module comprises a microphone, which enables reception of a sound token, which is generated in the mobile user device of the courier and / or the user.