It was positively identified in the reddit thread about half an hour after it was posted, not sure how the media has managed to drag the story out for so long
Taking their best guess is fine. Or just taking the top three comments that don't seem ridiculous.
In this case the top comment on /r/whatisthisthing is "Looks to be a perfect match for India’s PSLV third stage." with comparison photos, the second-top comment is "Looks like a fuel tank for a rocket of some type.", and the third-top comment is "looks very similar to the Delta IV heavy fuel tank".
It's a nice plausible answer and about as straightforward a question you can get for asking an expert.