I don't know. I was just a front of house, not a shift lead.

My understanding of what happened is that the till was counted as off, and then it was confirmed that it was them through the cameras.

There are anywhere from 2 - ~6 people who can open the till in the store at any time at that location, thus the need for the cameras.

Edit: Obviously not the best OpSec, but that was the workflow at that point, and hiring enough staff to make that not the case was non-feasible.