Location:

███████ ███████████, New Zealand.

Report:

A standard solid oak door, painted white, which manifests on load-bearing walls where no doorway exists. It possesses a brass knob and a keyhole.

Opening the door reveals the raw material of the wall behind it (concrete, brick, or drywall). There is no hallway; it is a door to nowhere.

Addendum:

█████████ ██████████████████████ ████ ██████████████████████████ ████ ███████ ██████████████ ██████ ██████████████ in █████ ██████ █████████████ ████████ ████████████████ ████ ███ ██████████ █████████████ ██████████████████ █████████████████.

Agent ████ placed his ear against the wood. He reported hearing a faint sound of a tea kettle and muffed television audio coming from the "other side" of the solid concrete.

He knocked once. The television audio cut out instantly. Heavy footsteps were heard shuffling toward the wooden door, followed by a low, muffled voice speaking from within the wall:

"Not interested, come back later."

Since this incident, the anomaly has remained dormant. The television has not been powered back on, and the tea kettle has ceased whistling.