From the FAQ, they say this,
You must provide a valid purchase receipt from an authorized retailer with proof of purchase made between Friday, October 7, 2016, and Sunday, November 20, 2016 and picture of V20 box with IMEI number.
And then they say,
What do I do if I can’t find my IMEI number?
IMEI numbers can be found on the product box, near the UPC code.
Followed by this,
What if I don’t have my UPC code or the product box?
IMEI number can also be found with the settings of the LG V20
1. Swipe pulldown bar from the top of the screen. Click “Settings” icon
2. Press “About Phone”
3. Press “Status: My Phone Number, IMEI, etc.” IMEI# will be found here
Shouldn't the real answer to "What if I don't have my UPC code or the product box?", be "1. Close the page, you are not eligible to proceed."?