It seems exotics that are not yet "discovered" (in the sense of reddit/communities/forums) are hidden from the API, presumably to prevent scraping and discovering these things, thus ruining the surprise. I'd argue that returning a hash for CLASSIFIED, would be easier than returning a hash that isn't there. As this makes my system difficult to know when it needs a manifest update vs when a piece of gear isn't present. I'm sure all will be solved as weapons are discovered and new manifests are published.