I think they should spare no expense at getting to the bottom of this. After all, it's not as if these ducks were unborn children or something.
Shredding human babies is legal, duck shredding is not.
The reason this crime needs to be solved is that the ducks were the Car Wash owners property. They were pet ducks, what value do you put on a pet? $5000 or $10,000? This is why it is a serious crime, even though it sounds silly at first blush to carry on about some ducks.
This was a case of destruction of someones property.
This is why we have police on the payroll.
Protecting and defending property rights is important.