Sadly these days I just walk away at the slightest sniff of scam, both as buyer and seller. Luckily most scammers are lazy and generic so they're easy to spot, but some are certainly more subtle, and a few are downright cunning. But for me there is a 100% watertight rule, trust your gut; if it feels dodgy, shut it down. There is a very good scientific database behind our evolved and largely subconscious ability to detect deception and cheating in others. But there's a problem and scammers understand that problem very well; the apprehension and anxiety that feeds into our gut feeling can be over-ridden by hope and its cognitive consequences; "I feel like it's dodgy (anxiety) but I want it to be legit (hope) and think how good it would be if it was....". Excitement! Anxiety is an evolutionarily ancient and tried and trusted emotion. Hope and excitement less so. Always trust your anxiety 👍
Apols for lecture, been a long week and i need a beer