The Apple Ethernet AUI Adapter is considered a power supply by the FCC and is NOT certifiable. The device is within the FCC Class A limits for emissions but it does not require certification nor the FCC label. The FCC will not certify this type of device.
The Apple Thin Coax transceiver is a Class B compliant device and carries both the FCC ID and the FCC 'interference' statement.
The Apple Ethernet Twisted-Pair Transceiver is a Class A compliant device and is required only to carry the FCC 'interference' statement and does not require its own FCC ID.
Also see the related TIL Article: "Apple Hardware: FCC Compliance"
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