There are two issues here. Slow shipping and possible fake item.
The seller shipped well after the 7 days his eBay Seller Protection allows, but since the item is now awaiting pickup, he did eventually ship and the item is available to you. If the Paypal dispute was for Not Received you will lose because there is tracking that shows delivery was attempted.
The second question is authenticity. You cannot know whether the item is real or fake without inspecting it. You have the word of the seller against that of another buyer. You don’t know either of these people, although the seller at least has a track record in his feedback and Detailed Seller Ratings.
If you pickup the item, and examine it, you may find the other buyer was wrong. Leave appropriate feedback and Detailed Seller Ratings for the slow shipping. The lowest Rating is ONE.
If you find the item is fake, you can change your PP dispute to Item Not As Described. PP will require that you return the item to the seller with Confirmation of Delivery. UPS is probably your best bet for this, but also check the price of Regular Parcel and Expedited Parcel. Use whichever is cheapest.
And again, leave appropriate feedback and Ratings.You have 60 days to do this.