Yes, I now have my own capsule! It sits on my desk at the moment. I can feel its worn-away felt ends, cold metal body, thready canvas details. I can look inside at its rusty insides. The little door squeaks as it moves, a satisfying suck of air and click as it closes completely. These are the sensory and material details of pneumatic tubes which I love.
If I look closely, engraved on the capsule are the words "The Grover Co. Detroit". My gift giver helps me to research the capsule's provenance. We find that the Grover Company was selling pneumatic tubes at the same time as Lamson, in the early 20th century, servicing department stores whose needs had extended beyond their cash railway systems. William and Clarence Grover founded the company in Woodburn, Michigan, but had branches in Detroit too. In the 1950s the Grover Company filed patents for pneumatic tube terminals. According to the Cash Railway site, Swisslog is the company's descendant.
I am sure there is much more to discover of the history of my tube.
Image my own.