GM Warranty, lost some receipts. Am I still covered?

[1 Wild and Crazy Guy]

I purchased a 2007 Chevy Silverado Classic in late 2006. It came with a 5 year / 100,000 mile powertrain warranty. I change my oil every 3 months, but due to moves I used different shops. Now I have lost some of the receipts. If something happens in the next 40,000 miles will I still be covered or do they have to show that a lack of maintenance caused the problem?