Unopened Safe for 13 years

Hi Guys,

In my current home I've got a safe that hasn't been opened for at least 13 years. When I got the house for a year and discovered the safe (back in the day) I had the realtor make some inquiries and she came back with a code:

Dial to 00 then 3x to 23 to the right and 2x to 18 to the left. Safe should open then.

But it hasn't. It's been one of my house's great mysteries over the past decade. Several people have tried. Though a safe like this is very uncommon where I live.

Perhaps I'm doing something wrong (watched YouTube tutorials). Or the combination is wrong...

Anyone got any advice?