Floyd with Barrett was a much different aspect in music than Floyd post Barrett. Even post Syd, but pre-dark side, floyd was a mega melange of both aspects. I guess i've got 3 albums that sum up my getting into each 'era' floyd.
Barrett era:
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Post Barrett/Pre Dark Side:
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Echoes is one hell of a trip.
Then Post Dark side:
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After listening to animals, I went backwards, discovered the above two & everything in between, after. Post Waters, etc.
Anything is possible, maybe they were melted down & cast into a make shift gibson ground plate for the control cavity