This is the only mailing address I can find for Al Michaels. It's his current home address, not sure if he goes home between Sunday Night games or not so it could be awhile before you get a signature there:
401 S Bristol Ave
Los Angeles, CA 90049-3820
Looking for Johnny Gaudreau (Calgary Flames) rookies!
If you put “the” and “IRS” together, it spells “theirs”.