Well, I had a wireless adapter laying around, so I put it in the machine. The kernel sees it as a rlphy0 but that's the only place that I can find it. Here's the relevant dmesg.
rlphy0: <RTL8201L 10/100 media interface> PHY 9 on miibus0
rlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX...