I've not done boots on a 4matic, only axles. BUT-they were noisy before I saw the car. you have noise, you get axles. no noise and FRESHLY torn or damp boots, you get boots. these cars I see a lot. you're new and I don't know how long the boots are this way or they are torn with no grease and no noise, we're gonna have a long talk about prospects. you get boots and have noise later, you're getting axles and not no charge. never had a cv make noise after a reboot. i'm also lucky to have a competent axle builder here in town. sounds like a cya policy with flawed language. get a 2nd opinion from a shop who can see this. I can't see the car, the light here sucks. good luck, chuck.