[Jaccmcmcnn]

Was the package purely dumped at your doorstep and a photo taken thereafter?

Yes, that's correct.

They've DNA'd themselves.

In such a case, photographic evidence Is useless for the fact that It was left unattended at your doorstep, hence anyone could've taken It. Even If the house number Is Included In the photo, It holds no grounds - the package was dumped, regardless of what the photo demonstrates.

Investigation was closed as I confirmed they the delivery was successful, do I just tell them that I never received it though?