Yes, I must admit that I, too, have released a pile of stealth notes as well.
While I try to stamp all bills (always on the back), there are times when I miss a few or my wife ‘borrows’ (😏) some notes before I get around to stamping.
Yes, shame shame on us as we know that stamped notes have a much higher chance of getting hit (allowing us to follow).
Yes, it seems that a lot of notes have been making it into Winnipeg lately. I also find that a lot of my stamped notes seem to make their way to Dryden/Kenora/SSMarie.