The Reverb G2 serial # is written in VERY small print on a semi-circular label under the "faceplate".
-Remove the faceplate (the padded plastic interface you had to remove in order to fit the cable to to the headset).
-There are labels either side of the lenses; look at the left label
-At the top left corner of the label is written the serial# (the writing is only 1-2mm tall - you might need a magnifying glass).
-Without giving out my serial #, it is written in the form of X=numbers, A=letters; XAAXXXAXAA (be careful if you have a "0" in your serial# that means Zero, not the letter O - at least it was for me).
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