Tessy this is more of a chat board - you might be better off posting your question on Buyer Central:

http://community.ebay.co.uk/t5/Buyer-Central/bd-p/21900000767

If I'm reading your post correctly though, you bought and paid for a shirt which you subsequently received on the 4th Aug.

Further to that, you then received an empty envelope from the same seller which you had to sign for. The seller has entered the tracking number for the empty envelope into the transaction details for the shirt he sold you on the 4th August. You haven't been refunded or anything but the shirt transaction is now showing as unpaid. Is this correct?

Firstly I would log into your Paypal account and check that your payment for the shirt hasn't been reversed or declined by your bank for some reason.

If it has, that would explain why the seller is so desperate to get a tracking number because without one, they won't be eligible for seller protection.

Check your Paypal account then contact the seller to find out what's going on. I don't think the seller is trying to scam you as such but I do think he is being a bit naughty.

Post your question on Buyer Central and see what the regs have to say.