A seller has not sent an item purchased for authentication - item purchased March 30th.

i purchased on the 30th of march & when i asked the seller to send tracking info when they sent for authentication they told me they would do that last Monday. Today I contacted the seller again with the request for tracking & they responded that they had, had the item in their car but unable to get to post office. They could send directly to me (bypassing the authenticity guarantee from ebay) straight away IF i wanted. i responded that No, i wanted the authenticity certificate. They responded again to say they had a certificate from Italy to show the bag had been cleaned! Then another message to say they would rather sell directly & for me to please cancel. This really irritates me as if I cancel I am unable to leave feedback for them as I feel that the probability of the item being genuine is low. Ebay shows I am unable to open a request until the 11th of March .... anyone have any suggestions please? Should I just wait it out another 5 days? 

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What is the item number?