Yes, the pre-loaded machines will be cleared, and a print-out tape made to verfiy zero initial votes.
That's how it was probably discovered this morning. (Frankly, Philly has 2000-3000 machines - I'm not surprise that a couple would not have been set up properly, esp. with the IQ level of some around here.)
The R and D election observers are at every precinct and would be the ones to discover this when the poll opens.
Each party gets a copy of this sort of information as a check against shenanigans.
Thanx.
Confirms what I learned here in WI about our preparations.