Is there any way to get a sheetID from the KEY retrieved from a sheet access report?

I am a system admin, and we recently had to let go of our other system admin. I am trying to find out what sheets he had access to that I didn't, so I could could access to those sheets. The only way I can compare what I have access to versus was he had access to was a sheet access report, which has a sheet Key, not the sheet id. Any ideas?

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