I tremble when I hear bike shops say things like "full service".....
Does that mean a major or interim service?, because 'full' isn't listed in the manufactures literature....
Head bearings would only be checked for play, not taken apart and re-greased. Same is true for swing arm.
In fact I suspect the bike has had an interim, Oil, Filter and check, which will all have come out as OK, it's only when you start putting miles on a low mileage bike (or car even) that the problems associated with low mileage examples start to show.
I'm a bit of a sceptic on these things, don't let me put you off your new bike, they are pretty bulletproof in most hands, there are the odd problem machine but on the whole they won't let you down. Even a completely sha99ed head bearing is hard to notice
er,, apparently!