“Once authorities are finished with the device, it will be sent to Quantico, where further testing will be done on the materials to determine what they are.”
It’s a turd with two wires.
The fake bomb also has a fake clock. Not to power anything (it couldn’t) but to make it look good. For what purpose? If sent by mail you’d need to set a timer ... To what time.
Somebody has said, these people are stupid!