I have 137-1943 steels, 17-1943D and 17-1943S. Total of 171 steelies. (I do a LOT of pennies though. A lot.) Got 100 in two rolls from a bank a few years back. Of the other 71, I bet 30 of them have been on MAGNETS in the coin dump machine. I get lots of Canadian money there, and some steelies. Got 2 steelies in one day on one machine. Side by side. Always check the magnets if you dump in a coin counting machine. Run your finger underneath (Gently, as staples are there too, as are nails, and if you poke yourself that could be a tetanus shot in the making.) and see what is there.
Oh, and I have one 1943 COPPER penny too. Although my best bet is it began life as a 1948 and someone filed it down to a 1943. It just doesn't look right. :-)