Set some filters (category, keywords, etc)
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Sort by listing creation date (usually the most recent Ebay listings are the best ones)
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Start from the top of the feed. Go through every opportunity, and click the "Inspect" button.
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Check to see if you can sell the item by clicking "can I sell?" If you can't sell the item because the brand is restricted, click "ban this brand from future searches" to prevent that brand's products from being shown in future searches.
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If all is good, add it to the "saved" list or purchase the item immediately. If it's not good, either report the item as a mismatch or mark it as "seen."
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Rinse and repeat! Finding good opportunities takes patience and persistence.