I used to have a U.S. Green Card but gave it up. What additional information or documentation do I need to provide to ensure you can accept my Form W-8BEN?

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I have a U.S. Green Card but am not a U.S. taxpayer. What additional information or documentation do I need to provide to ensure you can accept my Form W-8BEN?
Non-US persons and entities: How do I determine whether for tax purposes I am a nonresident alien?
FATCA FAQs - Issues Involving U.S. Green Card Holders
What additional documentation do I need to provide after my written explanation about my expired Green Card was rejected?