Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
Unfortunately this is not something you can simply get a code for online, for obvious security reasons, otherwise anyone could break into your home or steal your safe and then just retrieve the code to open it, rendering the safe useless.
What you'll need to do is fill out a form, have it notarized (to prove ownership) then send it in (along with a check) to Sentry. Note that in your case, possession infers ownership, just because you weren't the original owner does not matter, so long as you acquired it in good faith and can attest to a notary that it is your safe (not stolen, etc).
They'll mail you back the original keys if applicable and/or the override code.
You can get the form here: https://www.sentrysafe.com/Content/pdfs/NotaryForm.pdf
There are instructions on it for sending the info in by mail, or you can pay the fee online and fax/email the form after it is notarized.
I'm sorry there is not a quicker resolution possible, this process is in place to ensure security, so that not just anyone could get a code or key to your safe.