I got your safe ‘robot’ right here: edssafeservice.com/openings.html
The top left image shows how you should try to open your safe first, manipulation. second, you use your ‘robot’. It’s a stepper motor that tries every two numbers and whatever information you gathered from manipulating the lock. it uses a lathe check to grasp the dial and large rare earth magnets to mount the motor to the safe. after trying each combination it turns the dial past the opening point. if the combination is correct, the dial will stop, tripping a microswitch to say ‘Ta Da! it displays the combination on a LCD readout. the whole thing fits in a nifty briefcase. if you can get a number during manipulation, say wheel #2 is 37, you program that in after setting up the autodialer, LockMastersITL2000, and your safe will be open in less than 2 hours. i’m a certified master safecracker and a certified ethical hacker. after i learned how to pick locks i just got carried away.

Autodialer, a.k.a. LockMasters ITL2000:
http://www.lockmasters.com/index.asp?PageAction=VIEWPROD&ProdID=49863

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This reminds me of locker padlock cracking from back in high school. On the standard master-lock, you can lower the hundreds of thousands of combinations to 100 by a little bit of simple math (there is a few digits slip), then you can bruteforce it. Of course, the manual approach (a padlock shim) takes about 4 seconds, so….

Most combination locks can have the combination changed, pretty much all of them bar the cheapest ones. That means the serial number won’t gain you much – it is worth a try though.

My safe has a mechanical lock, and I made sure to change it on arrival as some safe companies keep records of the keys sent out with each safe. If I lose the key, I can get a locksmith to open it.

A box like this would be easy to physically break into using an angle grinder, probably less than a minute using a 300mm disc.

can you crack this safe?

As for alternatives, drill a small hole then fill it with water and a small explosive charge and boom it opens, been proven to be true.

What they do here with ATM’s is fill them with natural gas (or some such explosive gas) then ignite it and it cracks open, seems to work perfectly much to the chagrin of the banks who now had to close several ATM’s pending fixes like detectors and pumps that keep them free of gas and whatever counter-trick they can think up.

If it takes twenty hours to build a safe cracking dialer that can automatically open a safe in ten hours, or twenty hours of studying plus three intense hours of skilled labor to open it, building the automated dialer is already less effort than cracking it. Plus it’s reusable on the next safe with minimal effort, whereas you still have to expend serious effort on the next safe if you open it manually.

I’m not saying that learning how to manipulate a combination lock isn’t a worthwhile hobby, but it isn’t for everyone.

http://web.mit.edu/kvogt/www/safecracker.html

The only advantage would be the fun.