Verify Airbags

Folks,

Two owners ago, a bad guy stole the HV battery pack from my 2005 California Prius.
My concern is whether they took any of the front, side curtain, or front seat airbags.

No warning lights are on before, during, or after startup.
Does this positively indicate that all airbags are installed and properly functioning?
Is there any way to trick the system into thinking the airbags are installed when they are actually missing?
Is there a diagnostic test (digital or physical) to verify that the airbags are in fact installed and functioning properly?


Thanks,