The hunt for more wreckage from missing flight MH370 on La Reunion island has turned up no new clues with authorities saying metallic debris found by locals didn't come from an aeroplane.

However Malaysia urged authorities in the Indian Ocean region to be on the lookout for debris washing up on their shores, as hope flares a piece of a Boeing 777 wing could help solve one of aviation's greatest mysteries.

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Locals on La Reunion island have been combing the shores since the wing part was found last Wednesday, handing pieces of what they believe to be wreckage to police.

Several pieces of debris sparked excitement yesterday, one of which was believed by locals to be from a plane door, but investigators said it was from a domestic ladder.

A source close to the investigation in Paris said no object or debris likely to come from a plane had been placed into evidence yesterday.

Australian search authorities leading the hunt for the aircraft some 4000 kilometres from La Reunion are confident the main debris field is in the current search area.