It's a dubious situation, since CA law allows for "ballot harvesting", which the local Republican party claim this is a form of; they also claim an overzealous party worker put the word "official" on the boxes. There's been no allegations of actually going through the ballots and discarding those turned in by Democrats, for instance.

On the other hand, they are defying a state order to take their collection boxes down. The state has its own boxes, which are set up in a prescribed manner, and the Republican Party boxes are unauthorized. You can't just go around slapping "Official Ballot Drop Box" on a container and make it so.

It will be interesting to see what the courts do.