timdiggerm said:

As someone who has never noticed matte boxes, I just wanted to let you all know that this is absolutely fascinating. Matte lines? Oh sure I see those. Matte boxes? Only ever spotted them in enhanced shots specifically designed to show them off.

Possible exception: the near three-way Star Destroyer collision in ESB?

Yeah, older versions of ESB were loaded with them. Even as a wee tyke, I'd think 'why is there a square around that TIE Fighter?' Stuck out like a sore thumb. I don't know why they didn't do more to fix those. I'm sure they could've done something, even back then. Ditto for the see-through snowspeeder canopies.