For sale is a brand new unopened Sentry Safe. It is one of their top line models that is Fire and Water safe, and has digital electronic keyboard.
Bought this some years ago but never used it. I do not see exact replacement model on Sentry Safe's website, but seems like the SFW123GTC comes closest -- even though the new model is significantly lighter.
https://www.sentrysafe.com/product/SFW123GTC
The OA3810 for sale weighs 135 lbs while the new SFW123GTC weighs only 85 lbs so construction wise, this older unit is likely better.
New SFW model retails for $295 plus tax. I am asking $80 firm, which is over 70% off the new price and this safe is brand new never opened.
If interested, please leave your name and phone number and I will get back to you. Thanks