Alright, throw it on the pile. No not that one, it got too big so we prepared another room.

More seriously, for anyone who thinks this was a rare event or a one-off: A team of analysts looked at the per-district time series data (so the number of votes reported by each district over time) and found that this was happening all over the place. Never by a large amount, never too many in any one district, but they discovered thousands of instances of the totals for Trump decreasing, usually by being swapped with the numbers for Biden.