Paypal is not 100% with the report functionality. Paypal will not refund the cash if the bank account it's tied to is clear of funds. It happened to me, paid a guy for a game, he cleared out the account and skipped. My only recourse (per paypal) was to contact the police in HIS town, which was 12hrs away. Luckily it was for a $40 Xbox game so I cut my losses and learned my lesson.
Cash in hand, easiest, trusted, etc. But it involves traveling to see the machine. So you travel out there, inspect the machine, then watch him pack/ship it with NAVL if necessary, Pay him in cash, Then fly home and have a new machine! Costs you Shipping + Plane ticket, but you should have FAR less surprises than buying based on photos.