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The only scientifically known source of supernatural beings is the human imagination. If the source becomes scientifically known, then there is a natural explanation and it is not supernatural. If the source is non-natural, then it will not become scientifically known. So, the only sources that can become scientifically known cannot be supernatural beings. Therefore, we're left with the only other possible source which is the human imagination. If there was another source, and it became scientifically known, then it wouldn't be supernatural. If it was supernatural, then it wouldn't become scientifically known. So, the only source that can become scientifically known cannot be supernatural and we're left with the only other source which is imagination. But, if another source did become known... etc. etc.
Supernatural doesn't mean scientifically unknown. Supernatural means above nature, not non-natural. Originally it was used in a religious sense. Gods living in a higher realm (above the earth). Since 1799 it has also been associated with ghosts.
Nature is the physical world/universe and everything in it that isn't made by mankind. IMO, whatever exists (physical or nonphysical) and is not created by mankind is part of the natural world whether we know about it or not.
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If there was another source, and it became scientifically known, then it wouldn't be supernatural. If it was supernatural, then it wouldn't become scientifically known.
The source is not what is considered supernatural. Only the being. Until a supernatural being is found, we don't know if they would still be considered supernatural or not. Mankind changes word meanings to suit their purpose just as supernatural has changed over time. It can change again.
If another source exists that wasn't created by mankind, then it is already part of the natural world.
If a supernatural being exists that isn't created by mankind, then it is already part of the natural world.
Human imagination can play with words till the cows come home. We change definitions and seemingly move gods out of the reach of reality.
Right now, supernatural beings are created by mankind and aren't part of the natural world. The source is the human mind, which is part of the natural world.