Every ghost shell I have (I've got about 8 or 9 across all of my characters) has either a material sensor perk or a material extractor perk.
I have some for wormspore, some for spirit bloom, some for relic iron, and one for spinmetal. I do not however have one for helium filaments.
I've been looking at vendors, examining every ghost shell I get, looking for one that does anything related to helium filaments. For some reason, despite looking for over a week, nothing has shown up.
Do helium filament ghost shells exist? If so, how do I get one?
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Try the speaker. He sells them to.