If you have a CCW license, and you go to a place that a gun is not allowed, is it legal to store your gun in a safe box bolted to your car or a safe box that is strapped to a bolted down fixture in your car?   

You can store your gun in a safe that is out of view.  It doesn't have to be bolted down.

But, keep in  mind this doesn't apply to certain federal places like the post office. Even in their parking lot, it's illegal to have a firearm.

This doesn't apply?

  §134-C  Leaving unsecured firearm in vehicle unattended; penalty.  (a)  No person shall intentionally, knowingly, or recklessly store or otherwise leave a loaded or unloaded firearm out of the person's immediate possession or control inside a vehicle without first securely locking the firearm in a safe storage depository that is out of sight from outside of the vehicle.
     (b)  For purposes of this section, "safe storage depository" means a safe or other secure impact- and tamper‑resistant container that, when locked, is incapable of being opened without a key, keypad, combination, or other unlocking mechanism and is capable of preventing an unauthorized person from obtaining access to or possession of the firearm contained therein.  A vehicle's trunk or glove box alone, even if locked, is not a safe storage depository.
     (c)  This section shall not apply to a person in an exempt category identified in section 134-11(a).
     (d)  Any person who violates subsection (a) shall be guilty of a petty misdemeanor.

This doesn't apply?

  §134-C  Leaving unsecured firearm in vehicle unattended; penalty.  (a)  No person shall intentionally, knowingly, or recklessly store or otherwise leave a loaded or unloaded firearm out of the person's immediate possession or control inside a vehicle without first securely locking the firearm in a safe storage depository that is out of sight from outside of the vehicle.
     (b)  For purposes of this section, "safe storage depository" means a safe or other secure impact- and tamper‑resistant container that, when locked, is incapable of being opened without a key, keypad, combination, or other unlocking mechanism and is capable of preventing an unauthorized person from obtaining access to or possession of the firearm contained therein.  A vehicle's trunk or glove box alone, even if locked, is not a safe storage depository.
     (c)  This section shall not apply to a person in an exempt category identified in section 134-11(a).
     (d)  Any person who violates subsection (a) shall be guilty of a petty misdemeanor.

That's the law I mentioned.  It doesn't sate the safe has to be bolted down.

Got it.  Thank you CMO66