Re: The big question is...
I wouldn't worry.
Did you miss the bit where it takes 4 days of continuous work to open the safe?
Assuming that's an average, that's twice as long as the 'military' one (whatever that's meant to mean - if I had $15k I could buy one) which we had running against a Grade 1 lock for 3 days, and it failed.
So basically, check your safe once every few days and you are fine.
For what it is worth, an expert can crack these locks in under 15 minutes. I'm not brilliant at these, but I've done one in under 2 hours. There's the real threat!
(If you want to upgrade your safe, get in touch. )