What are the odds of an STC having useful information?

I was reflecting upon the story from Bricky's faction video about the STC that showed how to make knives on the tier of KMMO endgame stat squeezing. Since an STC could contain theoretically anything ever created by mankind, there would probably be a lot of unimportant or even redundant information within them. So if an STC is found, obviously it's to be reclaimed at nearly all costs, but how often is the discovery of any major significance to mankind as a whole?