Could someone please do this for me?

I have spent 2+ days trying to figure out how to properly unwrap a model in Blender. I understand the concept I just cant seem to get it to unwrap my model properly. It always breaks up the mesh into triangles which is no good to texture with.

If you could be so kind and do this for me and send it to me as a png or something? It’s a very basic model of a paper box(the one you store new sheets of paper in).

I would really appreciate this and credit you.