Make sure the auction does indicate "authentic" then pay using Paypal, and be sure to fund that paypal transaction with your credit card. (Paypal tries to use existing balance first, then bank account second.)
If it comes and it's fake, talk to the seller. If they refuse to refund, then file a chargeback with Paypal. If they refuse, then take it up with your credit card. Just be aware of the Paypal timelines- IIRC you only have 30 days to file a chargeback with them- and that might be from the date of payment; not date you receive the item.
And make sure the seller is in North America.
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