Let's hope the bomber(s) did something stupid like not wear gloves when handling the wires used to build the thing. Or one of the other components like the batteries, which they bought from a Chinese supplier that sells through Amazon, who keeps records.
Likely it will be some locally generated dim bulb. One can only hope they'll mention friends who helped over a can of pro-offered Coke. Or someone extracts it with "rubber hose methods" before the police discover said dim bulb.