If it was MAILED via USPS please file a mail fraud charge. This is illegal.
And yes, DO contact the police as well as the District Attorney in the county where you live and the seller lives (if different), AND the Attorney General in CA. You can find all these folks on the internet, via google.
They may help, they may not. File w/ USPS irregardless, if mailed to you via USPS. And EMAIL this seller and tell them that you are filing charges against them w/ USPS, the local police, and the District Atty, and the Attorney General of CA. If you have a valid address for the seller, also send them a registered letter and ask that it be signed for.
https://postalinspectors.uspis.gov/forms/MailFraudComplaint.aspx
Merchandise - Misrepresentation of Product - file as Counterfeit Goods.
It would be helpful if the LV store that you took the bag to could provide you a letter of NON-AUTH. If they cannot, and you need a letter of Non-Auth, contact
[email protected]. She can and will provide letters of Non-Auth, and specializes in LV.