Even when it was looking very likely a scam, I found it difficult to ask the awkward questions just in case there was an innocent explanation.
With the current increase in hacking of accounts, I think we shouldn’t be afraid of asking for as much proof as you feel you need before committing to a purchase even if its a member with thousands of posts who has been on here since the beginning. Similarly, I wouldn’t take offence to someone asking for proof...some ID for example.
Some people say speaking on the phone is a good idea. I’m not so sure about the effectiveness...I think these scammers would have taken a phone call. They seemed very well prepared to answer questions an supply pictures with usernames written by a watch etc.
To be honest, I skirted so close there that it has put me off even going secondhand at all for expensive watches now.