As mine is a 2008 GT with only 28,000 when I bought it last August, I was suspicious. Had it checked at a main dealer as part of building a snag-list to get sorted, which thankfully wasn't much.
Although suspicious, it had a full record of HR Owen, and a high profile media Lord as it's owner so not short of a bob or two.
Despite this the dealer took the trouble to crawl over the records (both paper and Maserati dealership records). Mileage at each stage checked against documented history, internal electronics and visual condition of components. She'd only done a couple of thousand miles in the recent years.
She was declared a gud 'un.
I was impressed with the thoroughness of the dealer's checks, they walked me through what they'd found; their view was that it was difficult to hide clocking.
Uncle Dick's in Swindon. They've been entrusted with the care ever since, found to be fair and reasonable costs.
Any doubt, go get her health checked at a Lovett's. They like doing it, they don't charge since they'll get momentum business from the goodwill.
If they find something, you'll have redress with the purchase, and possible prosecution