I did wonder why nobody has any photos of this happening to share. If he's got a photo of the drinks can and it was contemporaneous then how come he hasn't got photos of anything else that was going on? People take photos all the time even in the days before smart phones.
And the fact that he can describe and get to a room he went to just says he remembers a room they went to not that what he saw in there was not an added fabrication. I could tell you about a hotel room I've previously stayed in and tell you all about how I saw David Beckham there making out with the Queen. The fact I could lead you to the room and it exactly matches the description I gave of it doesn't make the rest of the story true (its not AFAIK for the avoidance of doubt !)
The problem I have with Coyle though is he previously lived and travelled with Armstrong and the team for 2004 to write his eulogy,
Lance Armstrong; Tour de Force and he didn't notice anything at all untoward in all that time living with them as a fly on the wall journalist? Did he not notice that they were doping or that suddenly they all became unavailable to him (while they doped with him not there) ? And then he added about 20 extra pages to the original 315 pages, gave it a new title,
Lance Armstrong's War, and misleadingly (IMO) sold the same book all over again much to the upset of a number of purchasers. So not averse to trying to make a buck or two out of a story.