This happened in WA, but could happen anywhere there is drop-boxes.
Please put in a little extra effort by checking to make sure your ballot was received after you drop / mail it in. If in doubt, ask for a provisional ballot.
"Voters can go to www.votewa.gov to see if their ballot was received."
Arson destroys hundreds of ballots inside a WA drop box • Washington State Standard
State and federal authorities are investigating a deliberately set fire that destroyed ballots inside a drop box in southwest Washington.
Washington State Standard (washingtonstatestandard.com)