Two layers of 3/8” black weatherstripping takes care of it, but I agree that it should come standard. Chances are, it would be offered as an add on kit...
Another thing that I’ve noticed is that with the power supply (fan) in the backbox on Spike machines, there’s a lot more dust circulating that works it’s way between the LCD and display plastic without a seal there. Happens on pre Spike games as well, just not as quickly in my experience. This is referring to location machines which are turned on for 18 hours/day for what it’s worth.