I got the "low down" about this today from different people who saw it happen.
The Lear Jet landed at Chino and took on fuel to the left of the local controller, about the controllers 10:00 o'clock - 500', where it's very visible.
After taking on fuel a van pulled up and started unloading duffle bags on the ramp, weighing each bag on a scale before putting them in the Lear. Maybe someone was math challenged because this went on for a long time. Not surprisingly, several people on the airport starting watching the bags being weighed.
After several minutes of watching this activity the tower supervisor is on the phone giving a minute by minute to the FBI.
This is the funny part, after the duffle bags were weighed some had to go back in the van.
You can't make this stuff up!