Volunteer Julie Walters has combed Mussel Rock Beach south of San Francisco for wreckage, but all that's turned up so far are wave-battered boat parts and lumber of unknown origin.
If she did find an object with a direct link, "I would find it quite intriguing that it made this incredible journey across the Pacific," said Walters, a volunteer with the Pacifica Beach Coalition. "It would also sadden me to think of the human tragedy."
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AP writers Becky Bohrer in Honolulu and Tim Fought in Portland, Ore., contributed to this report.
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