Don't worry the mills expect a customer to provide receipts for carpet cleaning every 18-24 mores for the entirety of their carpet life. No receipt, warranty void. Moreover, the warranties for the most part are pro-rated on the the life of the carpet, 20 years you can expect $.03 on the dollar spent, most won't go through the trouble. The reality to the texture retention is that the nylon fiber won't be abraded and it's right next to impossible to abrade nylon. Finally, the new fun in carpet is non-prorated warranties, triexta 25 years, shaw bellara polyester 10 years, doesn't matter the face weight or density. Personally, I just want to file claims for my customers at 20 years to make the mill blow $400 to send someone like Jim go inspect and deny the warranty. Warranties are there for customer piece of mind, instead of written on swiss cheese, should be toilet paper.