does japan sell fake burberry or not??i duno how to see ler...

i went to one of the departmental store in Shibuya...then there is one department selling wallets, scarf, handkerchief....then i came across burberry London wallet...selling like 18900 yen for the long type of wallet....where i went to the blue label...is like more exp than that.
then i ask the sales gal to take a new one.. it came with a box...but the zip is not sealed. im afraid is not genuine. dont know how to differentiate between real n fake one ler...how?? i almost bought it...but since im not confident..so i did not...