My "junk" box has given me hours of fun. Here are some of the Duplex Killer Cancels, showing the number. So, I have two questions:
How High a number did they print? I have found many, many number 1's, several 2's, then they seem to decrease rapidly with increasing numbers. Here, I have a 26 and two different 30's.

I also wonder how difficult it is to tell the "6" from the "9".
