It is genuine, all apple products are expensive on apple.com, they give discounts using outlets like flipkart, amazon, because they buy in bulk, they get special discount.
On apple.com they don't change prices nilly-willy or give discounts, they have a policy that if you purchased a product from apple.com and it's price changes in the next one year, you get difference amount refunded.
Also it's marketing, they don't want their product prices to appear cheaper, because if anyone checks their price they check on apple.com, but they also want to give the customer discount, so they use other outlets.
Flipkart give open-box delivery on apple items, meaning the delivery guy will open the box in front of you, once you confirm the product is okay, then you share the OTP, otherwise it will be returned from there only.