Two things. If the price is discounted enough, it should be good to go. That piece is a trim/retention ring that is easily replaced with a new one. Secondly, if it arrives and the performance of the lens is effected, and there was no mention of a focus problem or an operation problem - it can, in fact, be returned. That's your Ebay protection - regardless of whether the seller accepts returns. Anything not as advertised can be returned.
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