THEY USE FAX MACHINES AT THE MASTERS

Luke Donald mystery solved. From @ToddLewisGC: When scorecard was faxed, a 5 on fifth hole looked like a 3. No issue, no DQ. Just the fax.

— Jason Sobel (@JasonSobelGC) April 5, 2012

Oh good god. To further quote Jason Sobel, if they only had the head of IBM around, this could have all been solved rather easily.