jesse unfortunately it's unlikely this will unlock. The "check" to see if the phone can be OEM unlocked (once connected to internet) doesn't take very long. Maybe a few minutes at most.
This has happened to me to an "unlocked" phone. Unfortunately, it's only referring to being carrier unlocked.
When I purchase a second hand model, I now thoroughly check the model and IMEI if I can get that info to determine how/from who it was originally purchased.
Good luck!