Ask for pics that have some odd object in the picture that couldn't possible be there before you ask.
e.g. If you are buying heads, ask the seller to place a couple of toy cars, or bottle caps, or something IN the picture to prove that he is selling you legit items that he has.
Otherwise you will be buying a
picture he stole from a thread here on SN.
When I bought my STB from some guy here on SN I asked for him to include Stangnet For Sale written on a piece of paper. Granted paper with marker/pen can be replicated with some effectiveness with Photoshop, so it's better to use objects.
I would advise to actually stay away from PayPal altogether.
www.paypalsucks.com
Use money orders through the USPS.
http://www.usps.com/money/sendingmoney/welcome.htm
That way when/if he tries to scam you, it turns into a federal mail fraud case.
Document ALL transactions, communication, and information, trivial stuff can really aid you in a fraud investigation if you have it.
And if you can, have a guy here on SN go check it out in person, before you buy it. There are many individuals on SN that would help you out.
Stick close to and work with the SN/Corral community and you will be less likely to get burned.
