Slice asset not loading - source control not fixing problem

I'm having some trouble with a slice not loading after manipulating it in windows.

I'm getting the following error when the level is opened: [Error] Slice asset {2A23859A-D8C3-564C-BB43-ECAF41F74D80}:1 not ready or not found! Slice data based on the asset will likely be lost.

The level I was working on initially had 1 entity. I created a slice from it in order to create a new entity based on it in the editor. I also performed some operations on the slice file in windows, such as duplicating/renaming it and maybe deleting some copies. When I reloaded the level today, the initial entity and the second entity were missing and I was getting the error.

I tried restoring an earlier version from source control. Our source control currently tracks just the project directory, and it hasn't caused problems until now.

My questions:

1. What is trying to open the slice asset? Where is it looking?

2. When I created the first entity, I didn't create a slice. Where is that slice stored?

3. Is there a small amount of files that can be added to source control to prevent this? The source control outlined here is not feasible: http://docs.aws.amazon.com/lumberyard/latest/userguide/lumberyard-upgrading.html