Just had an order from someone who has left FOUR negatives out of the 10 feedbacks they have ever given.
Wish I could cancel.
Does any of the feedback look like an unresonable buyer or more like could have been the sellers they bought off ?
Others have come to the boards with similar and then the buyer turns out to be a good repeat customer.
Don't stress over something that may not exist. 
1. Could be a seller that didn't get the price they wanted.
2. Buyer used mobile to leave feedback and often wrong button is pushed because they are so small.
3. & 4. Bought from China and items rubbish.
So I think no need to worry. Just make sure order is packed nicely and professionally looking.
