You may not have to mail Form 8453-C. Often just sign and save for your records.
When you printed the return, it should have a 'Filing Instructions' sheet to tell you which forms need to be mailed as well as the address to which to mail them.
Since you can't upload 8453 to states (like Federal), you may need to mail it to California.
Click this link for more info on California Form 8453-C.
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