Parcel returned

Hi - I've just had a parcel I sent to buyer on 20 April returned to me. I checked the tracking information - delivery was attempted on 24 April, it sat at the post office until 9 May (which must be the requisite 2 weeks) and has now been returned to me. I've checked the address given and recorded (PayPal) - all correct. Of course I should contact the buyer to tell her what's happened, but I just wanted to find out what the protocol is in these cases. Who pays the postage to resend the item? It was only a $10 item, so I'm not happy to pay to send it a second time.


 


Any comments and/or suggestions would be appreciated.


 


Cheers


Audrey