How do you know if you have an original louis vuitton bag?
I must edit this to state that Louis Vuitton boutiques do not authenticate anything that was not purchased directly from them or through an authorized retailer like eluxury, nemians, etc. You can purchase online, you just must educate yourself on what fake and real bags look like. Join some forums that are directly devoted to designer accessories and you will get much more help in authenticating any future online purchases.