You guys are so accustomed to telling people that they are hopelessly guilty that it has altered your sense of reason.
You can't think of a defense that would explain why a customer was not following the checker through their every move? How about "I was texting," or "I was talking to my friend," or "I was thinking about something else," or "it isn't my job to follow the checker's every move," or " I was trying to recall if I forgot something?"
As a prosecutor, your only argument would be "most people would have noticed those items skipped?" ...And you think that would be a slam dunk conviction?
My advice: Start seeing through the eyes of a defense attorney, not a wishful prosecutor. But since most here want to see people convicted, the tide here flows in the opposite direction than it should.
The only way they'd even hope for a conviction is if they found an I-phone stuffed in a box of Cheerios...and not even then unless they had video of him actually doing it.

