Hey Stu, welcome to BF and congrats on the 9x45 Maven.
Specks inside the bin is one of my pet hates, so I may be biased, but you just shouldn't get that with a thousand dollar instrument!
I would contact them and have a conversation with them so that they are fully informed (I'm sure they would be very interested and disappointed in the situation too) and arrange to send it back. They would probably send a replacement rather than go through the extra time frame of repairing your particular unit. As Jerry said, they will probably cover shipping, but confirm it.
With a new unit (I'm sure they will personally inspect to make sure there are no specks inside
you of course run the minor risk of some unit to unit variability, but at 1K this should be negligible.
I think the psychological annoyance of an imperfect unit at that price, and the potential for future problems down the track with your unit (possible glare issues, or further specks forming if flaking off something internally, or fungal growths forming if the sealing is less than perfect, etc) outweigh any slight change in feel of a new unit .....
So you are possibly talking potential for the issue to worsen, or ..... nothing may come of it. If you are famously happy with the rest of the bin, focus feel and tolerances etc, glare performance of the bin, and can see no ill effects in the view caused by or of the speck - colour fringing or other weird effects due to the speck, then you may decide to just keep it. Make sure you thoroughly talk to and inform Maven of the options (send photos etc) -- they may be happy for you to sit on it for now, and send it back later if anything further negative develops.
Ask them if this is a common occurrence (what % of bins are affected), they may want to inspect a random sample of n=30 bins, and take other quality assurance measures, contact their Japanese suppliers etc (something like this is the way most quality assured businesses would operate). So I'm thinking that they would be very interested to get your unit back.
Talk to them, and talk to them some more. Good luck.
Chosun :gh: