What is this hole in airbox for? please help

[baikunewzealand]

Honda Varadero XLV1000 2008 FI

at the rear underside of the airbox there is a mystery hole which i cannot figure out.

It goes to a chamber inside the airbox and has foam covered holes which again lead outside.

What hose is supposed to be here? does anyone know?

[S Barker]

There are 3 small "air" pipes that connect to the airbox.

The 2 at the rear connect to the cylinder head covers via a solenoid for the PAIR system.

The one at the front activates the Variable Air intake Flap/valve via a separate solenoid.