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Buying a car Is asking to put a lot of trust in the seller. Will he get the registration and title handled Quickly, will they do the servicing at a fair price? Hard to trust someone that doesn't trust us enough to let us be armed.

JustSomeOldGuy wrote: As for the other problem; a car is a car is a car. If the next Acura dealer is an inconvenient distance away, then don't buy one. Buy an Audi or BMW or Lexus or a whatever from somebody closer who isn't posted 30.06

That's sorta like saying:
A gun is a gun is a gun. If the next Ruger Dealer is an inconvenient distance away, then don't buy one. Buy a Glock, Smith & Wesson or Spingfield or a whatever from somebody closer.

One way to document their permission is to mention it in an email to the "apparent authority." Email is a great way to document verbal agreements. This can be done subtly, for example in an email your boss you can present a short argument (maybe a recent news event) on why the signs could be a liability, and casually mention thanks for giving you an exception to carry. This may not be as airtight as a signed, sealed and notarized document, but its something.