new xbox console buyers wants refund

I'm new to ebay selling and really stressed out so please ignore if i missed anything. Recently sold an unopened xbox console but buyer's complaining there was cut on seal, cable missing and sticker missing (I don't even know what and where that sticker should be) as I've not open the box to see everything. I know its really hard, how I'm going to establish the truth because I didn't opened the console and so far everthing should be there. She wants to raise complain 'item not as described' to ebay. I have taken all pictures carefully so buyer can see the state of the box from the pictures as well as explaining the slight damage about the item on description hence did not hide anything. I've read similiar stories from sellers and it said refund the money as ebay will protect buyer's any how. But how I'm going to make sure she is not going to change the console ( the one I've sent to her) with broken or return something else. what i should do now?  any law to protect the gadgets? is there way to find out , if ther's any how? 

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looking at the pictures in your listing you can see the box has previously been opened - all 4 seals broken and 2 poorly resealed.

 

So it appears the buyer is telling the truth and as you've no idea what was in the box be thankful they're not claiming it's a brick instead of the console. Probably best to apologise and tell them to open a return, provide a return postage label and then full refund once you've received it back.