Are Incoterms binding by law? Who is responsible?

Incoterms® are internationally recognized terms of agreement for buying and selling goods across the globe. They are agreed upon between the seller and buyer in regards to when the risk and responsibility of the goods and transport are transferred. Join us in a Q&A Session and learn from U.S. Customs Broker and Trade Compliance Firm. This isn't your typical webinar. Topics include: Background of Incoterms®, What Incoterms® are, What Incoterms® are NOT, Changes from 2010 to 2020, Most common Incoterms® and more. Email [e-mail] for a FREE consultation related to your supply chain or trade compliance. Visit www.scarbrough-intl.com

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What happens when the Exw incoterm is used and the item delivered is rusted. The seller claims it was in good condition when it left the factory and blames the rust on rain during shipping, the buyer claims the box was not wet when it arrived and therefore the item must've been rusted before going in the box. Is it acceptable for the buyer to request a video of the packing process?