It's a hitchhiker guide to the galaxy reference, where sure, something is technically available but not clearly published and there are hoops even for those who know what they're looking for.

(No clue if it's applicable here, I'm not aware of this case, but I believe that's the reference if it helps :)

Edit : exact quote, as Arthur's house is about to be demolished for a highway bypass:

"But the plans were on display…”

“On display? I eventually had to go down to the cellar to find them.”

“That’s the display department.”

“With a flashlight.”

“Ah, well, the lights had probably gone.”

“So had the stairs.”

“But look, you found the notice, didn’t you?”

“Yes,” said Arthur, “yes I did. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.