I’ve checked in the location indicated by https://mysupport.razer.com/app/answers/detail/a_id/548 for blackshark V2 X, but only found several numbers that aren’t Razer’s usual 15-characters long. They look like this:
X-X-XXX-XXNN-NNNN
CAN ICES-003(B) / IC: NNNNX-XXNNNNNN
NMB-003(B)
FCC ID: XXX-XXNNNNNN