EXO gear locker box SN location if any?

[Percy_4Run]

Kind of a shot in the dark but for anyone that has the Exo swing base/gear locker do you know where the find the serial number for warranty registration? Or is the box not classified as a “cargo box” where the registration says those are the only things with SN’s. I’ve looked all over the box several times.
Thank you in advance!

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