A box has been found containing detailed drawings of alien beings, an unidentified flying object, and transcripts exploring the link between alien encounters and ancient religions.

A user on the social media platform Imgur posted a series of photos  showing the contents of an old wooden box, roughly 29 inches by 38 inches, that his friend found in the garbage. The post had more than 250,000 views as of Monday morning, about 20 hours after the user uploaded it. It has not been independently verified.

The musty box contains clues, but also raises many questions—it’s a mystery.

It appears to have belonged to a man named Daniel J. Christainsen who lived in Florida but was a native of the Netherlands. He may have been a WWII veteran—the box contained a blank paper with the Veterans Administration Medical Center header. He may have been an engineer, or at least was technically inclined—the box contained technical drawings of roller bearing designs. He seems to have had an alien encounter.

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