Per 
Item #: SCP-XXXX
Object Class: Safe
image of the rattle in museum before anomalous properties were discovered
Special Containment Procedures: object can be safely and securely held in a general containment box[I DON’T KNOW THE OFFICIAL NAME OF A REGULAR BOX]
Description: SCP-XXXX is a pig-shaped clay rattle which, despite being empty, makes a perceived rattle sound. However, x-ray scans of show it is empty.
The artifact employs an extremely potent memetic agent [or whatever the non-hazardous equivalent of a cognitohazard is] to convince all subjects within a reasonable vicinity into believing they are hearing the instrument. strangely, it only produces nominal vibrations, as detected by microphones, decibel meters, and other such devices.
The rattle can only be “heard” if perceived to have been agitated. If a subject views the rattle being shaken, then loses sight of the object, they will continue hearing it until the object has actually stopped shaking. This proves that the effect is not merely heard from actual active perception and there is some other connection.
The artifact is in no known way hazardous.
Discovery: The rattle was discovered at the ruins of Amarynthos in modern-day Euboea, Greece. Similar rattles were used to ward off evil spirits. For this reason, non-anomalous rattles have also been used as offerings to the gods in children’s tombs, such as the one the artifact was retrieved from.
The artifact was formerly housed in the National Hellenic Museum in Chicago, where it was scanned to show nothing inside to produce the sound heard. Roughly three months after, the foundation obtained legal rights over it, and it was transported to the foundation for study.
