Anyone know where the serial numbers are (or should be) on a jl 10w7?

[Range Rover W7 10+ year member]

I was told by someone that there should be a serial number on the mounting ring of the sub (visible when you push the foam ring in & after removing trim and o-ring)....

Please let me know where the serial number is on the sub. (or as stated, where it should be).

Thank you.

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