2. "Voting observers" can only see people putting paper ballots into counting machines. They have no idea what the machines are doing with them, because that work is being done by software running on the machine.
3. Essentially "voting observers" might catch some obvious cheating like throwing out paper votes, but cannot catch the potentially much larger and ubiquitous cheating in the software.
4. Let's see the source code. Let's verify that the source code, when compiled, results in the object and executable code that was actually run on the machines.
5. Source code is almost always kept in some sort of "version control system" - those need to be impounded and imaged (duplicated) ASAP.
LET US SEE THE PLACE WHERE THE MAGIC HAPPENS!
