A sterilization box seal device comprising a shaft (2) capable of being slid into a closure device (5) of a sterilization box, and a support part (1) of the proximal end of shaft (2), which comprises a locking element (31) irreversibly capable of cooperating and attaching on the distal end of shaft (2) so as to form therewith a closed loop preventing the closure device from opening, such that the support part (1) comprises an additional part (8) to the support one (11) necessary for the sole seal function, said additional part comprises an area (82) capable of receiving a readable identification label.