Hi. This is the first time I have posted anything on this site so please forgive me if this is in the wrong place. I want to know why some of my mulberry bags have serial numbers and some do not. Most are bought at the airport where I work or in the Bond Street store in London. I do have a couple bought at an outlet with no numbers on the back of the disc but I have just bought one at the mulberry store at the airport (in the sale) which has no number on. I'm very confused - can anyone please help?