Are there any other ways to get hextech chests besides you or an ally getting an S?

Right now I have 15 key fragments, which I get nearly every game from getting honored. But it is incredibly difficult for me to get hextech chests, so I just have a ton of key fragments lying around and doing nothing, while everyone I play with has skins, but I can get none because I never get any chests!! Are there any other ways to get chests besides getting an S or buying them with RP?
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