Shipped items missing from package

[lexibee1994]

I recently sold my macbook along with a power adapter, charging cable, and case. My buyer just informed me that while she received the laptop, the cable is not with it. I'm 1000% sure that I shipped everything listed above. I have no idea how to go about resolving this issue. 

[simba6 · Accepted solution]

Have to try and offer a part refund.  Better than have to take it back.