Most of the re-useable shipping cans pictured are made of aluminum. These were an innovation, saving shipping expense because they were significantly lighter than the traditional metal cans.
Left to right: Trainman, Robert Naylor, Earnest Page (worked at Lilypons from 1930 until 1999, beginning at age 30!), unknown, Dr. G. L. Thomas, JR., unknown children, train engineer, Virginia Louise Thomas, Barbara Yinger, Railway Express agent, unknown.