To be fair, I have the tendency to stuff this GunVault NV300 lockbox with a lot and it sometimes has knocked iteelf off its combination. This time I am pretty sure I went through (most) the 1000 possible combinations (10*10*10) and suspect it's at half-gateway. I don't have a decoder tool and needed into the box (for paperwork not an emergency). 

I decided to do a brute force attack just to see how tough it is and in case the knob was just stuck.

The answer? About 3 seconds.

The pics are self-explanatory - I don't want this in the car. Plan accordingly.