I would normally get a bit cross about the courier's solution, but I had forgotten I would be away for next few days and they only try three times before sending parcel back to sender, so the courier actually solved the problem for me.
Both of us were out when the parcel arrived so the courier left it in the porch and got round the 'signed for' bit by getting my porch to sign.... as you can see.
Not sure what would have happened had it not been there when I got home.