I'm actually surprised that for a military industrial complex area with lots of govt facilities there is only 1 safe technician listed at SAVTA's site.
https://www.shortywallin.com/Phone: 757-722-0883
Location: 345 Woodland Rd
Hampton, VA. 23669
Email: support at shortywallin dot com
Here is another place you can contact, they do military bases, which means they'll know how to open your Mosler safe.
https://locksmithofvirginiabeach.com/go ... -locksmith(757) 467-3282
4291 Holland Road suite #113
Virginia Beach, Virginia 23452
Please note that they may charge you $100-$200 just to come out and try the combinations you have written down. If they have to drill a little hole and stick a scope inside to see the combination wheels line up inside the safe door, that may take hours of work for that style and brand of safe and they may charge you anywhere from $250-$750 labor to open the safe.
In my experience, 90% of safes are empty, so you will have to decide if it is worth spending $200-$750 to find out the safe is totally empty.
You can tell them you have a Mosler Old Style Lug Door. The lock inside the safe is probably a CD-120 or an MR-302, but it could be a couple other models that were also used in this style Mosler safe.
As you have already discovered not all locksmiths are safe technicians, although there are locksmiths who are good at both traditional locksmith work such as fixing doors and installing deadbolts as well as safe opening and servicing. Good luck and do come back to let us know if you end up getting it opened. Do you know off hand when the last time was that this safe was actually opened and used? Did your family use it while at this building or moved in years ago and it was already locked and you never used it?
Thank you,
Squelchtone
PS. I know you said you are not on site, so it is hard to test this, but you could check if the safe is possibly open already by trying to turn the T handle counter clock wise, if you turn the combination dial does it turn freely or is it stuck?