If it's a crime to put other people's absentee ballots in the mail, I can think of a few dozen scenarios where this law will prohibit people from voting.
You are encouraged to list them, in detail, with appropriate speculation as to the consequences, then.
One wonders where these people are that mail doesn't get picked up.
I remember the election of 1960, where between Cook county IL. and west Texas, enough votes were manufactured to steal two states. Some counties in West Texas had 180 percent turnout! Without those two states Kennedy would have lost. Later, when Nixon won, the Democrats complained about "dirty tricks". Surely the voter fraud as described in this article is the ultimate dirty trick.
It is an affirmative defense to prosecution, however, if the person assisting the voter is a relative, a registered voter living at the same address or if the individual provides his or her printed name, signature and address on the outside of the envelope carrying the ballot.
There is no crime if you mark on the envelope that you handled the absentee ballot.