Could it be we're confusing what an alloy (or some composite) is made of vs _how_ it's made?
For example (and it's just an example for the sake of discussion), many here couple probably analyze the skin of a stealth bomber and identify what it's made of. But that still leaves how it was made.
It seems reasonable to think we have things - which could be non ET - that we can't quite figure out and don't want anyone else to know either.
Obviously not a popular idea for HN but certainly not impossible.
For example (and it's just an example for the sake of discussion), many here couple probably analyze the skin of a stealth bomber and identify what it's made of. But that still leaves how it was made.
It seems reasonable to think we have things - which could be non ET - that we can't quite figure out and don't want anyone else to know either.
Obviously not a popular idea for HN but certainly not impossible.