Hi Gaetan,
Thanks so much for your response.
I'm not that techy, so I'll try get a friend to help. I understand some of what you're saying but this sort of stuff isn't my expertise at all. :/
When I got home from picking up the HD, I put it into a dock and realized that they wiped everything off of it by initializing it. Now, I have an "Untitled" drive with nothing in it.
When this problem first came up (before taking the HD to them), I put it into the same dock I mentioned above, and ran a scan with Disk Drill. The scan revealed that there was over 300GB of files on the HD, but I didn't have the software, an extra HD, or know-how to restore the files. Each time I plugged in the HD to the dock, it asked if I wanted to "Initialize" it and I never did.
All I have now is the HD with no case. The parts are all separate. I can try to get a friend to help with your suggestions, but now that the HD has been wiped, I'm not sure what the next course of action should be... :(