I love blue label too but not an expert when it come to Blue Label Burberry.
For Blue Label bags from what I observe is they will have a white tag with a serial number that match the serial number of the paper tag that comes with the bag which is blue. Serial number lists the materials used, says made in japan, and lists the manufacturer's name and address.
Second, it has a Blue label stitched inside and the BURBERRY is capitialized.
I have seen quite a few replica when I was in HK and I will post some pictures soon.
Picture speaks a thousand words