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http://pages.ebay.com/help/policies/listing-multi.html
What are duplicate listings?
Listings are considered duplicates if they are for items that have no significant difference between them
The following types of listings, if they are for the identical item, will be considered duplicate listings even though the listing format or details may vary:
Auction-style listings for identical items even if they have different ending times, start prices, or reserve prices.
An auction-style listing with the Buy It Now option and an auction-style listing without the Buy It Now option for the identical item.
A fixed price listing and an auction-style listing with the Buy It Now option for the identical item.