I've had occasion to use their "No questions asked" warranty, and it really is that way.

My last company bought a Toshiba laptop there -- needed a one-off, so it was quick and easy to do it that way.  I came back from a trip, and the LCD display was dead.  Costco took it back with no problems.  This was about 2 years ago.

Even better, last year, my next door neighbor had bought a desktop LCD display there.  About 3 months later, it died.  He couldn't find the receipt or the original box.  He still tried to take it in.  They looked up the purchase and agreed that it was still under the 6 months no questions asked period, and exchanged it.  Now THAT's customer service.