Buyers asking to speed up or send first class postage is always a `Red Flag`, that indicates that things are not going to go well. I used to accommodate these requests, but have now learnt my lesson. Do NOT refund until you have the item back! Just ask your buyer to open a return with eBay, and they will receive a return postage label. When you have the item back you can check that it is the same as the one you sent, and check for damage. If all is OK then you can refund and relist. ......and add the buyer to your banned list! You will not get a negative strike.