I’d be lying if I said I tried a Baconian cipher…

Bacon Cipher for K4?

 I did take a look at how they work and decided that it’s extremely unlikely that one was used in K4.

I was trying to imagine how these types of ciphers could be used now and besides riddles or fun between friends, I couldn’t think of much.  If it was a difference between two very similar fonts, I’m not sure I’d be able to eyeball it well enough.  Even a slight size difference would be subtle.  I guess if the text was copy and pastable electronically, i.e. not some letter in the snail mail, then I suppose one could write a bit of code to detect formatting changes relatively easy and then translate those into the hidden message.

For K4 solutions however, it is useless.