replaced odometer

Volcom370Z

Hey guys... I'm new to the forums as I just bought my 370 last week. I already had an issue and I figured I would run it past you guys to see what you guys think. I bought an 09 with 5200 miles (and got a DAMN good deal fyi). Well from day 1 I noticed that when I turn my lights, the back light to the radio and climate control knobs wouldn't work. So I took it to the dealership and they ordered a new gauge cluster and determined it was caused by a company they outsource to for alarm systems (one of those upsell items when you buy the car). So they ordered the new gauge cluster with 5998 miles but when I went in to the dealership today to get it installed, I had 6362 on my odometer. So I got my car back with less miles (per the odometer) than it went in with. The service manager said it is perfectly fine and not to worry about the difference in miles. Any of you out there work for Nissan and can vouch? I've just always heard that changes in the odometer are no good, but the dealership ensured me that these changes are acceptable and documented with Nissan motor company. Is 300 miles no big deal? I'm having an OCD moment about it...

Thanks

Bob