Get relation between several items to match between lists

Im having trouble with index and lists; i got 157 elements (sewer inspection chambers, idk how they are named in english) , that are into another revit elements (floors, that plays the role of sites, where every house is built). So i have information in the floors, that i want to put into the sewers inspection chambers.
So i created Bounding boxes around the elements, intersected all of them, and i got a result in which for every sewer chamber, i ask for its respective intersected floor, now i need to get a relationship between them, so i can get the parameter that i need and traspass it to the sewer revit element;

Any idea?


@lalbornoz , convert your BBoxes with BoundingBox.ToCuboid and look, whats wrong with intersections.