I am getting ready to purchase a beauty LV (gently used) from Ebay. The seller has perfect ratings and says the bag is 100% authentic.

There is a 7 day full refund, return policy.

So, I have 7 days from the day I receive it to inspect it and make sure it is real.
How would I know?
Should I just take it into a LV store and compare? What should I look for?
Zippers? Buttons? Interior?