Fake Cadenas question

Does anyone know if they make fake cadenas? The only reason why I'm asking is because I saw someone with a Birkin and a crab cadena. I don't remember a crab cadena ever being made. Perhaps I'm wrong. Can someone clear this up for me?

Thank you.
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It could have been something non-Hermes? Sort of a decorated lock?

Or it could be a fake. These days there is a market to fake anything that people crave to own (even luxury brands that you would probably not consider well-known enough to fake)
I haven't heard about cadenas being faked and if they did, they would most likely fake the current ones. I have seen lots of women decorate their bags with non-H charms so I would assume that the crab was another manufacturer.