There is a scam going around which involves sending copies of Western Union receipts to the seller. In my case I was looking for a vehicle to purchase and saw an offer too good to be true. The seller asked to be contacted by email, which I did. I was told the seller had the vehicle while they were in the UK but had moved back to Europe and did not have time to sell the car. However they would be willing to fly back and complete the transaction if I were to transfer the money via Western Union, to a friend or member of my family, thus showing I had the funds but the funds could not be accessed by the seller. WRONG. What happens is the seller asks for a copy of the receipt, even though it has the name of a friend or family member. The scammer then strolls into any Western Union office in the world with fake I.D. and withdraws the cash. I avoided the scam because alarm bells started ringing and I did some research into scams. Remember, if it seems too good to be true, it probably is and never use Western Union for buying on the internet.
Hope this has been of some help.