Always arrange handoffs and inspections in busy public locations during daylight hours:
Never hand over money until you have personally inspected the item:
Counterfeit checks, fake payment confirmations, and reversible peer-to-peer transfers are common online scams:
If an offer seems too good to be true, it almost always is. High-end items listed for a tiny fraction of their market value are frequently scams, counterfeit, or stolen property. If anything feels suspicious, walk away.