Be especially cautious when dealing with buyers or sellers in other countries. If you have a problem with an auction transaction, the physical distance, difference in legal systems, and other factors could make resolving it even more difficult. Get the name and contact information of the company or individual. The name, physical street address, and email address or phone number are helpful in checking someone out and following up if there is a problem. Don't do business with anyone who refuses to provide that information.
Buyers be wary of claims about expensive collectibles.
Since you can't examine the item or have it appraised until after the sale, don't assume that claims about its condition or value are true or that photographs are accurate. Print out and save the description and any photos of the item to document the claims that were made about it. Ask about delivery, returns, warranties, and service before you pay. Get a definite delivery time and insist that the shipment is insured. Ask about the return policy.