Hi @matt.hansen,
Hope you are well!
The Levels or Grids? Either one of them can simply be redrawn, but if they deleted the Level Grids then all referring views associated with the deleted level will be deleted from the Project Browser.
Create new levels under the Architecture Tab >> Datum >> Levels.

To get the views back in the Project Browser, go to the View Tab >> Create >> Plan Views (or use drop-down) then recreate the plan view which they deleted. (Only after creating the level as mentioned above).
Regarding moving the levels, this can be done by simply going to the Select Level or Grid they wish to move >> (Modify Tab) will activate >> Modify >> Move or use the align tool.

After:

I hope this helps! 
Rudi Roux
MSc | Digital Engineering Manager
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Revit Mechanical & Electrical Systems 2018 Certified Professional | Revit MEP & Architecture 2015 Certified Professional
AutoCAD 2015 Certified Professional | Autodesk Building Performance Analysis (BPA) Certificate
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