I'm not saying it's not suspicious...but considering many poll workers are retirees like my dad (who's worked at the local polling place for at least 10 years now and is now a site supervisor or some **** like that)..well, it wouldn't shock me if one year my dad put the ballots in his car to take to some central collection point and simply drove home on autopilot by mistake. Thankfully he hasn't done that yet, but he's also not getting any younger.
So in a country with however many thousands of polling stations across the country, it doesn't suprise me when this happens a couple times every election.