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.