N662PU is taken. It's currently assigned to a Talos Drones T60X registered in Lecompton, KS.
See the full aircraft record →A tail number only frees up if the owner deregisters the aircraft or moves it to a different N-number — and even then the FAA holds it before releasing it to the public.
Tails one nudge away from N662PU that aren't assigned or reserved: