No -8s in the desert as of 29 October
5 were stored, N772BA for NCA still appears still not have been delivered.
I don't know if it's the same airplane you're referring to, but I believe the last new 747-400F sitting in the desert went to Kalita
LoadAir Cargo 747-4HQF(ER), LN 1416, still registered as N797BA. The aircraft I think you are referring to I think is LN 1419, registered to Kalita as N782CK.
1416 in the front, 1419 in the back