getting layer size

I'm trying to get the size of the layers and it is wildly off if I use top, bottom, left, right to calculate it.

I found some box bounds here layer.layerData.textProperties.EngineDict.Rendered.Shapes.Children[0].Cookie.Photoshop
        .BoxBounds but text layers don't always have this. 

How can I find a position and size of the layers from the data provided? 