ICloud usage

When I check settings>General>ICloud>manage storage I see 100MB still on an IPAD that I returned and had replaced due to a battery defect. How can I find out what is in that 1000MB of storage? Is this just the data for the standard things that are on the IPAD since I did wipe my IPAD clean when I returned it.

I would like to erase that 1000MB from my storage usage if it does not have anything personal from a backup done on my old returned IPAD.