Nah, I've worked in dental. Those machines are insanely expensive. This is one hand-held unit for sale just under 3k, down from just under 7k . That doesn't count the sensors, which are also crazy expensive.
https://universadent.com/product/nomad-pro-2/
Most offices have machines attached to the wall, which would be extremely difficult to steal. But a nomad is portable.
https://dentimax.com/x-ray-sensor-comparison/
Above is ONE sensor (most offices have at least 2) that costs around 7k. There are other neccessities as well, but I think you get the point
Yeaaah probably fake, but given that it could be easier to just get it back by asking rather than rescheduling patients, dealing with the police, and waiting for insurance to cover the expensive equipment it's... possible that this is legit (probably not, but possible)