The seller's responsibility ended when your purchase arrived at the GSP plant.
Since you are well past the 30 day deadline from last estimated date for arrival, I don't think eBay will be able to help you.'
Just in case, go to the original listing and try to open an Item Not Received dispute. Make it clear that this is a GSP shipment so the seller, whose only fault was choosing GSP, is not hurt by the Dispute.
If it is accepted, GSP will have to prove delivery or you will be refunded.
If it is not accepted you are still covered by Paypal.
Go to your PP account-> top of the page-> Activities
and open a Dispute.
Again say that this is a GSP shipment.
And again, if it is accepted, GSP will have to prove delivery or you will be refunded.
Or start here
Go to the Pitney Bowes Parcel Tracker page at https://parceltracking.pb.com/app/#/dashboard/
I have never used this and can't say much about it.
You should have received a UPSxxxxxxx tracking number when GSP accepted and forwarded your purchase.
If you did not use PP, you may be able to get a chargeback on your credit card.
If you used a debit card or a gift card, neither PP nor your cc can help you. Don't use either for online buying in future.
