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Get a hold of live agent and explain your situation. "Contact us", then"message center", then type "need more help" when prompted. Might have to wait for live agent to respond but that's seems to be the only way to talk to PP customer service.
As this is not as the result of a dispute then i doubt customer services can do anything to help you.
You can't file non receipt of item as you received it.
You can't file not as described as presumably the item was described ok just didn't fit so the return was between you and the seller.
Personally i would tell the seller that you returned the item and have proof of delivery so if they do not refund you then you will be pursuing a small claims court action against them. As you have proof of delivery you would most likely win OR if you funded your paypal payment via a credit card then try and see if they will help you with a chargeback.
Most sellers will quickly refund if they think you are going to go down the small claims route.