Tricky Press Release Question.

Hi,
Well my question is pretty simple, suppose i order a pr blast from say a company like prweb or businesswire, would there be any way to tell that the content is driven via those websites? what i mean is would there be a thumbnail on the top/bottom of the press release (say that's on usatoday) mentioning that this content is coming from prweb? or would it look totally authentic and generic.?

Thanks,