Thats because most of the gas has escaped, just over time. I have a couple of sets of new-old-stock dampers and they are exactly the same. All the gas does is pressurise the oil to stop it cavitating and foaming under heavy usage, but the actual damping function will still work just fine in normal use. Unless you take it to the Nurburgring or chase Citroens down dirt tracks I doubt you'd ever notice the difference.
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