Obtain key of a certain position

Hi all!

I am using hiver version 2.0.4 an I am wonder how do I get the index of a certain element. Actually, I retrieve data from a box and afer that I filtered it (using .where ). Since I am building with the filtered data a ListView.builder, I am not able to delete or update any data in the box since my index inside the ListView is different than the one in the box.

Is there any way to retrieve the key in the box?