Pshaw... Those were just "oh S moments".
Be glad you don't leave your 3 in the rain with the trunk not all the way shut (even though car says it is shut.)
Then you end up with an "oh F moment".
View attachment 370157
Note, the felt under the trunk liner can absorb a lot of water that drips on it over time. If you press down hard on the bottom of the trunk you can find the hidden puddle.