When you place a request for a WTB / wanted item, you may get private messages / conversations from a relativley new member offering you the item you're looking for in like new condition. The person may ask for your phone number to send you photos by txt, followed by a request for your email address to send you the photos by email. Only pay for the item by Paypal purchases and not by Paypal friends and family payment.
I had this experience after a WTB posting for a RC51 exhaust. The guy wanted payment by Paypal friends and family only. I suggested he could have the payment by his preferred method, but he should send the exhaust first and once I've received the exhaust, I'll then send the payment. No prizes for guessing what happened. Keep safe!