You are not alone, it's a big problem. (Flipkart in general is problem these days)
PSA to those who purchased something recently:
Please check this & reply there if your downloaded invoices from flipkart also missing serial no. of the product.
It was open box delivery, are they supposed to open the iPhone box? Checks to be performed are listed on the order page. And yes, open box delivery means they'll open the sealed box in front of you.techenclave.com
Ingram then Consumer Court.Update: Flipkart refused to correct the issue of missing serial numbers clearly refusing to reissue any invoice with correct serial number & basically saying you are on your own if face any issue in future while availing warranty. This response was from their 2nd level/last point of contact for a customer & no higher level possible to further escalate the issue.
Ingram then Consumer Court.