Do you need to worry if your travel by plane with a 78L board who don't have a vent/plug or screw?
Cabrinha Macro doesn't have such a device...I guess they cannot all be shipped by boat or by land!??
What I can say for certain is that I have flown with my board (Appletree, which doesn't have a vent) many times without issue. My understanding is that it depends on construction and most boards without vents don't need them based on their construction.