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Used this address:
San Francisco Giants Attn: Will Clark
AT&T Park
24 Willie Mays Plaza
San Francisco, CA 94107
Side Note: I know Will still works for the Giants as a adviser that's why I sent to the Giants Stadium, but the envelope was postmarked Fayetteville, LA - I was aware that he lived in Louisiana so either they forwarded his mail to him, or he picked up when he visited the stadium.
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