scams
To those that arent aware of how they operate, they will offer to buy your item sight unseen and offer to send you a check for the amount of the item plus the cost of the freight to send it to whereever.
Being in a rush to get the bucks, people will cash the check and ship off the goodies. A couple weeks later, they get a letter from their bank that the check was bad, this letting you know you are out whatever the item was you sold, plus the cost of the freight, and often you will have a nasty letter from your bank telling you that you are overdrawn.
Quite often, people will have spent the money they thought they were getting in the check, only to wind up having to float a loan to get out from under the whole mess.
Usually the scenario is that the person contacting you initially will describe himself as a purchasing agent for another party, and will negotiate the deal.
Next you will hear from a second individual perporting to be the selected freighting agent for the as yet unnamed purchaser. You can rest assured that within 48 hrs after receiving their check, they will be contacting you wanting you to immediately get the freight arrangements made and ship the item.
If someone offers to send you the money to pay the freight, this should immediately set off an alarm.
When I sell things over the net, I accept only Postal Money Orders, Western Union Telegraph Money Wires, or CHC. ( Cold Hard Cash).