[mothered]

For this one the DNA above would be difficult as the doorway leads directly to stairs. I have a parcel weight scale so im prepared. I'm corrected in saying total weight is calculated in packaging box?

You'll be purely claiming the package did not arrive, hence the weight Is not relevant to the DNA method.

Whether It weighs 100 grams or 100 kg, makes no difference whatsoever.

He left the parcel outside, didn't knock and took a picture with it on the door step.

Perfect DNA material.

He can take 100 photos If he likes, It still doesn't change the fact that It was left unattended at your doorstep.

Calling for DNA tomorrow

Do exactly that.