i wouldn't hold my breath expecting this. maybe something like an alien beer can. but too ambiguous to be entirely certain it wasn't just a natural mineral deposit. no. anything like that, would be just too convenient to find in our own solar system. but, there are a couple of the nearest other solar systems where we might be likely to find something on that system's 'goldylocks' planet. or maybe even life itself.
they may also be less. to reason to assume anything. and there is no one aliens. every world on which sapience evolves, is just as alien to every other world on which it does, as it is to our own. we're just as alien to everyone else as they are to us. sure there may be one or two worlds, out of the billions, on which there are people who look a lot like us, and billions of other life baring worlds on which we might not even be able to recognize that life is life. let alone who the people are. its only our own egos that demand we be able to recognize anything.
https://www.newscientist.com/article/dn9943-top-10-controversial-pieces-of-evidence-for-alien-life/ Top 10: Controversial pieces of evidence for alien life.