I'm always been curious (went to the museum several times and had been noticing their shipping containers many years ago so looked into it) from what I could find they are not related to the very much CIA "Air America"/Evergreen Helicopters/Evergreen International Aviation. This Evergreen also has an airline seems to independent and from Taiwan, so while still possible CIA was involved it doesn't seem to be linked to the Oregon firm. A family friend worked at the Oregon Evergreen and I asked him about this, he was unfamiliar with any ties to the Taiwanese shipping company of the same name but he wasn't involved directly in any of the spooky stuff so it could well have been outside his wheelhouse.

If anybody has more and/or contradictory info I'd love to hear it!