I'm honestly not sure who is "misplacing" the ballots.
It is quite common in WA and OR elections at the state level.
In a governor race a few years ago, they "found" 3 closets of ballots ... at 3 different times ... and the court only ruled to stop counting the "found" ballots, from Republican areas, once the Democrat had enough votes to win. (The court allowed counting "found" ballots from Democrat areas.)
The "misplaced" ballots are found by county election workers.
WA and OR are completely mail-in ballots. So ballots can arrive a month ahead of the actual vote. Why are workers placing boxes of ballots in unsecured locations, that nobody is aware they are being stored? No reporter or investigator has ever asked the county workers.
My personal opinion is it isn't necessarily about the candidate ... it is about initiative measures that somebody doesn't want to see pass. So they "misplace" ballots from certain areas that would tend to vote in favor of whatever the initiative is. When it backfires, and they don't have enough votes to elect their chosen candidate, they "discover" the "misplaced" ballots.