I'd definitely dig your ref pics....
and holy cow! Yup, there it is. A 2nd 'bottle.' I've never noticed that ever before. There is no 2nd bottle on the sideshow one
I'll upload the pics I have in the next day or so, but the second bottle is visible in these two googled pics.
You can see its harsh reflection on the left chest area of the ESB screencap - I think I always assumed that a single bottle had slid into that position, but if you look closely, you can see that one bottle is on its side with reflection, other other is pointing straight upward so we can just see its base.
And you can see the second bottle laying on the left side of the package image here, just to the left of the more visible bottle: