Soldered a couple of wires onto the DC power jack socket. Thankfully the Chromebook powers on when the charger is connected. Now it powers on when the lid is opened. :)
If you don't know the Apple ID accociated with the device, then any effort to use it will be futile. The only thing you can try to do is contact the original owner and ask them to turn off Find My iPad - assuming that the iPad isn't lost of stolen, of course.