Questions & Answers about Policie našla tašku bez dokladů.
Because it is the direct object of the verb našla.
The verb najít / našla takes an object in the accusative case.
So:
- nominative: taška = a bag
- accusative: tašku = a bag, as the thing that was found
So:
- Policie našla tašku. = The police found a bag.