Greetings Silveradoking,
Sorry to hear of your loss. If you don't mind - I have a couple questions that might help the rest of us.
1. What yearand model of Silverado did you have?
2. Did it have the Chevy theft deterrent system?
3. Was there glass on the ground (did they break a window to gain entrance)?
4. With 16 cameras - I'm curious - was there a guard and did he hear an alarm or horn honking alarm or anything?
5. Did you have keyless remote entry that got "recorded"? (if no broken glass and no alarms sounding from prior questions - this is then the most likely)?
6. Did you have a "hideout" key that might have been found?
Again - sorry for your loss. Hope things get better for you.
White Lightening