Perhaps they had been chewed by rats along the way. That's very, very common. All the Coke machines do have insulation inside of them as the way to keep the cooling inside of the machines.

King, Charles, III, and Das Narayandas. "Coca-Cola's New Vending Machine (A): Pricing To Capture Value, or Not?" Harvard Business School Case 500-068, February 2000. (Revised December 2000.) ...

Coca-Cola is availing itself of the growing trend toward Wi-Fi use by smartphone owners with a new strategy to enable wireless connectivity through its branded vending machines. The Wi-Fi-enabled ...

As restaurants ditch self-serve soda fountains, Coca-Cola is linking machines to people's phones. On Monday, Coca-Cola announced that it is rolling out an update to its Freestyle machine that ...