I'm writing a little report, for those who take interest in findings while in foreign countries. I have spent several days in Peru. I have come across about a 100 notes from circulation. I also went to get a strap of uncirculated consecutive 20 sol notes directly from the central bank of Peru as well as ten 200 sol notes, also consecutive. None of the notes I have come across during my trip were a replacement note, assuming the current replacement notes have the prefix Y, a thing of which I am not even sure. Most of them had the prefix A or B(for the older notes). That leads me to think they are pretty scarce. I wish I had had more time, I would've managed to buy more straps and check for replacement notes and get a better idea of their rarity. I did however find in my strap what some call a "bookend" note with the serial 1370137.
