Point Quark at story that links to more than one text box

I have a lot of scripts that act upon a single box (usually the one selected).

for example:

tell document 1 of application "QuarkXPress"
	tell current box
		tell story 1
			set (every text where it is (ASCII character 9)) to (ASCII character 11)
		end tell
end tell

But if I want to do a find/change throughout a story that links through more than one text box,
what would say instead of “tell current box”?

Assume I have one of the story’s boxes selected, but not all of them. “Tell current story” doesn’t compile.