I agree with everything you said but the bolded part. If you have no receipt, you will receive the lowest price the item has ever been. They will not give you MORE than what was paid for it, just because the current price is higher. So if the item was purchased at full retail price, but was on sale two weeks ago for 50% off, w/o a receipt you will receive the sale price. Otherwise people could buy stuff on sale, then return it for full price and make money.