...well, I do not know if it could be...but here we go.

Three months ago I sold a V3 2000 boxed and sealed. When auction has ended, I sent a message to the buyer to confirm the amount of needed shipping to UK (He seemed to be in UK by reading his profile...). He replied to me that I had to send the card not in the UK but in Poland instead...so He upgraded his profile with the polish address...OK , so He paid, I left the feedback as usually I do and the later day I shipped the card to Poland...via economic, so without a tracking number (what He paid for).

Some time later (probably one month later or more) he contacted me saying He still not have received the goods . Worried about that, the first thing came in mind was an uncorrect shipping address , so I checked his profile again and I discovered indeed, that He changed his address again after I shipped the card . The address was still a polish address, but he added some other precious infos this time...

I said to him that probably the card would be come back to me in Italy, but in the meanwhile I suggested to him to keep checking his mail. Indeed days later, the card came back to me and the buyer wanted I shipped it again trough a trackable shipping. In the meanwhile, afraid I break away with both money and card , He opened a claim on Paypal, resulting locking my account...

I said to him that if my Paypal account is locked, I cannot receive money for the second, trackable shipping. He replied me again saying first the card, after the money... I am an honest person and I like to handle situations in order to make happy all, so, do not ask me why, but I agreed and then I shipped the card once again without getting paid for it...

Later, checking for the shipping, I saw that he got the card few days after, so I asked to him if He could be so kind to unlock my paypal account and then pay for shipping and leave a feedback...

Moral of the story; thanks to God, He closed the claim unlocking my account but, obviously, no money and no feedback

If you want (and if it is allowed) I can post the ebay nickname of  this POS

He waited a month 
Maybe he just opened a claim because he wouldn't have been able to do so after 45 days. Correct me if I am wrong but isnt it the sellers responsibility to ship the item tracked if they want Paypal protection.
Did you get the money for the extra shipping?

Well that sucked then, I suppose the fact that he had changed address didn't sway Paypal into unlocking your account.