I think the main point here is that the OP posted a scathing remark against Tamron based on his own refusal to comply with established and published rules, and then completely abandoned his own thread showing total disdain for the community.
He knows now his problem is of his own making, not a Tamron issue at all so he is ignoring his own thread. Not much point in trying to help someone who really only wants to complain about something and not actually have his "problem" addressed.

My daughter-in-law gave me a new Tamron 18-270 F/3.5-6.3 Di II VC PZD for Christmas to use on my Nikon D3300. Due to the frigid temperatures I have not had a chance to use it yet. I went to register the 6-warranty on the internet yesterday and was unable to complete the process because I didn't have the original sales slip (proof of purchase) to submit with the paper work. So I called Tamron Customer Service in the New York area this morning and explained that I didn't have the original sales-slip because the lens was a gift. The lady very rudely advised me that I could not register the 6-year lens warranty if I did not submit the original sales slip, regardless if it was a gift or not. I feel very reluctant to ask my daughter-in-law for the sales slip since it was a Christmas gift. The very rude Tamron CS rep said "Sorry, no proof of purchase, no warranty on the lens." I'm very disappointed there is no provision for registering a gift without the original receipt. But I am more disappointed at the rude attitude this CS agent displayed. It's very doubtful I will purchase a Tamron product in the future. Just a word to the wise, if you are buying a Tamron product or receiving one as a gift, you'd better get the original bill of sale or you can forget about their 6-warranty on their products.

PROOF OF PURCHASE is the one and only way ALL manufacturers verify that you actually bought the lens new and not used. Its required! If you choose to sacrifice your 6 year warranty right because you are too "embarrassed" to ask for a copy of the receipt, then that is your choice and your choice ALONE. If she does not want you to know what she paid for the lens she can simply black out the amount. But Tamron NEEDS to know WHEN the lens was bought AND whether or not it was bought from an authorized dealer to validate the warranty. No camera or lens manufacturer will require any less! Tamron offer their "Pre-Registration", you do not HAVE to pre-register for warranty work, but you WILL have to submit that proof of purchase to receive warranty repairs in the future. Their pre-registration is simply a convenience to the customer so you don't have to submit that same documentation again in the future should you need service.
Time to put on the big boy pants and follow all the rules that the rest of the world has to follow!