Last night on American Pickers they visited the original Dr. Pepper bottling plant in TX. It stopped bottling Dr. Pepper in 2012 and now bottles for a small local soda company. They didn't look at any bottles, but a lot of other memorabilia.
http://www.history.com/shows/american-pickers/season-15/episode-4
http://www.history.com/shows/american-pickers/season-15/episode-4