It doesn't seem to have sunk in...
Ti, how it gets posted is nothing to do with the buyer.. ALL that matters is it is DELIVERED.. Until that happens the responsibility for concluding the transaction is with you.
It needs to be spelt out to you.. YOU are legally responsible for the buyer receiving the goods. The seller has a legal right to demand you refund him the money as you have not upheld your side of the deal and are in fact now refusing to do so. If you no longer have the CD's in question then you should either make an arrangement for something else that the buyer is happy with from your CD collection or you should refund him his money in full. It's a very simple procedure that you are obliged to follow. A small claims court would sort this out very quickly and it would not be in your favour.
Like I said...
Sort it.. or I'll ban you

