> In fact, it seems strange that the secure ballot box would be deliberately stored somewhere without security cameras.
I've been a voting official a couple of times in Germany. Here, the ballot boxes (which are literal trash cans, just in a different color) get loaded with everything (ballots, tabulation aids, even the pencils) at the end of the day and sealed off, then over night left behind in the room where the election and counting happens (usually a school classroom), and at the beginning of the next day we verify the seals haven't been tampered with, unload the cans and continue counting.
I've been a voting official a couple of times in Germany. Here, the ballot boxes (which are literal trash cans, just in a different color) get loaded with everything (ballots, tabulation aids, even the pencils) at the end of the day and sealed off, then over night left behind in the room where the election and counting happens (usually a school classroom), and at the beginning of the next day we verify the seals haven't been tampered with, unload the cans and continue counting.