[theamk]

Or even better: find an old ethernet switch, gut it (but keep the connectors) and put Raspberry PI inside. You will need to solder 6 wires for ethernet and power, but the pins are fairly large so this should be easy.

Even if discovered, most people would not bother taking it apart --- they'll just assume it is broken and throw it away.

[jordan801]

This is exactly what I was thinking. Even the network admin would probably be like, "well, I don't think so but I'd better not mess with it, just in case it's how the CEO is getting internet". Unless of course they engineered the network originally.

[jandrese]

Or as a PoE injector. Even better is to make it piggyback on an actual PoE injector plugged into legitimate hardware.