I am selling some things on Amazon, and I usually print off a shipping label as soon as something sells, then mail the package the next day before I mark as sent. It just occurred to me that I could print off a label, and then the buyer could cancel the order, leaving me with a worthless shipping label. Am I allowed to mark as sent as soon as I print off the label? Just wanted to make sure I wasn't violating Amazon's selling rules or anything.