Coach handbag

I honestly cant tell if the bag is authentic or not i dont want to mislead anyone, i bought the bag from ebay and it has the tag as pictured but i dont see the serial number on the tag like other coach bags. im lowering the price for that reason it is a really nice bag and looks real. Apparently i may have been fooled. I used this bag once it's a great bag lots of room just a little too big for what I carry. Any questions let me know. This is my first listing on poshmark but I buy all the time.