‘Perhaps’ the answer is found in just who opened the chestthat was not a member of Aaron’s Levitical Priesthood.
That would be the people who received the ARK when the Philistines found it was too hot to handle.
Note that they took cattle with calves, tied up the calves, placed the Ark on a cart and the cows pulled it to the Hebrews who then opened the Ark.
No cow will leave her calf, so these were signs to the Philistines that it was God’s will the ARK be returned to the Hebrews.