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As long as you follow the terms set out by OfferUp you're protected and safe up to $500 per sale. Only requirements are that you paid using the Offerup app and to contact support right away. You have 3 days to contact support to report any problem. The seller only receieves the money after 3 days have passed after the item shows delivered. So as long as you do before then it won't be release to the scam seller. If you do so after 3 days then you have no recourse other than filing ouout a police report and working with your credit card company if you were smart enough to use a credit card.