They ought to be providing the provenance of the documents up front and center.
You can't just say something like "We got these super-secret documents that the CIA, the DIA, and the intelligence services of all our allies haven't been able to find."
I'm not saying its impossible, but after RAThergate, who will take any documents at face value, especially from a small partisan news source? That's probably the reason that none of the MSM and even Fox have shied away from them.
They did provide the provenance of the documents, just not the name of the non political appointed employee. This means he is a career employee and his job is on the line because I'm pretty sure he broke the law in providing the documents.
They provided far more provenance than Blather did, who was finally forced to admit what everyone had already guessed.
I'm not saying you shouldn't be sceptical, but we should all demand that professional journalist do their damn job and investigate the news instead of filtering it to suit their political agenda.