I purchased a Dyson air purifier last May.  It had been working just fine until this morning when the readings were very obviously incorrect.  Did all of the troubleshooting.  Was on chat for 1 ½ hours trying to get a solution.  Because I don’t have the box it came in 6 months after I bought it, or any box that it would fit in, and I live 150 miles away from the nearest UPS Store, I am apparently out of luck.  I can’t believe that Dyson won’t mail me a box to return their defective product in.  Paid $529.99.