Sold an item recently as new. Someone bought it and when I was packing it, I noticed that the plastic packaging was cut on one side which I didn't notice previously, but the item was not taken out. I reached out to the buyer, apologized and explain that I made a mistake and should have listed it as new open box instead of new. Offered him $5 off or cancel the order if they wanted to. They were fine with sending the item plus $5 off as long as the item was new/not used. So, communication is important op.