Instanced static mesh are light but different too, i am not an expert about instanced stuff so i suggest you to :
add-static-mesh instead of isntanced, this will give you a return pin witht the reference to the mesh and you will be able to pin out the location
OR
Since you spawned the Instanced-Mesh, the location is the same you have in the transform before the spawn,
grab the location from there , check if is relative or not !