The Senate win of Al Franken involved finding a box of paper ballots in a car, I believe.
The paper ballots I’m referring to are locked in the machine that they are inserted in that counts them. our ballots are marked by the person voting and tabulated and secured by the machine. It’s what we use in our county, ballots that did not come out of the machine would not be counted. I doubt any system could be developed that eventually couldn’t be circumvented but I certainly don’t trust any electronic system where a hard copy is never produced and some of those are in use in my state but not my county.