Can you help me to authenticate this Chanel bag

[Fitmonster]

hello ladies! I purchased this bag on tradesy. Paid $5300. Would appreciate your help
Item: BNWT Boy caviar old medium shoulder bag
Seller: cutiecue
Item # 15586717
Link: http://trsy.co/15586717

Many thanks!!

 

[Swanky]

Hi,
Again, all authenticity questions must be post in our Authenticate This Chanel thread in our Chanel Shopping Forum please.

Thanks!