How to check if a CID already exists locally without downloading

The following situation:
I have an IPFS deamon running, I got an email from somebody with a CID which I could downloaded.

I would like to check if I already downloaded the CID and its content.
So it should not a direct download be triggered.
How can I achive that?
I have not found anything in the CLI commands. (Probably I have not found the right command)

After investigation

ipfs refs local | grep

-> not nice anyway