The present invention relates to an RFID cap for a cryogenic vial, the RFID cap comprising a cap body; and an RFID tag attached to the cap body, the RFID tag comprising an RFID chip and an antenna connected to the chip. The present invention also relates to an RFID box lid for a cryogenic vial storage box having an array of storage slots capable of receiving cryogenic vials; the RFID box lid comprising: a box lid body; and an array of RFID tags positioned on the box lid such that when the box lid is located on the storage box, each RFID tag in the array is aligned with a storage slot in the box.