And then two years down the line you lose all the data - the pictures, the savegames, the porn collection. Drives are the one thing that shouldn't be bought used
This is all assuming it's a spinning disk and not an SSD, so ignore me if that's the case:
Given SAS drives are usually used in data centre storage array applications and 3TB disks have been kinda small for that use case for a fair while, there's a fairly high chance it was in heavy use for a good number of years. I'd bet it's probably well on its way to being a paperweight regardless of your connectivity situation.
If you do get it hooked up, don't store anything on it you wouldn't be okay losing.
Wanted a scratch disk to aggregate all my sensitive information thats scattered and duplicated on smaller disks and thumb drives. Would probably keep it as an ultimate backup too (I got a real backup).
My thinking was that usually those disks are swapped out after 5 years when failure rates starts to creep up, but there's still is some life left, largely enough for some fun.
For internal use, you can get a used PCIe SAS Host Bus Adapter fairly cheap BUT you need to do some research. Before you buy one you should confirm that there is a driver for the OS that you are using and that it is supported on your processor/socket/chipset. These cards are server hardware - many of them are not supported by Windows and/or are not compatible with consumer motherboards & CPUs.
What you do is to look on the local used hardware sites, search for server, fet a cheap one with SAS interfaces, and now you have the start of a homelab.