Rattle behind steering wheel within dash when hitting bumpy road

I have a 2018 Prius V (Canada only release, it's same as the 2017 V in the US). And a few weeks ago it developed an annoying, metallic rattle behind the steering wheel.

When I removed the paneling (all except the top most part since it's connected to the A column panel) the rattle was definitely louder. The rattle is coming from deep within the dash.

The rattle occurs whenever I hit bumpy roads at higher speeds. I took apart the surrounding paneling and did the following troubleshoots:

• Tightened the Intermediate Steering Shaft bolt. It was already locked down tight
• Took apart the paneling beneath the steering wheel and tightened every accessible bolt
• Tried tightening and holding down the ducting while driving as explained in this old post. Noise is NOT the ducting because even when I held and secured it the noise persisted

Any guesses?

 

Problem solved- the rattle was caused by a loose junction box. Probably from an electronics project from a few years back. Tightened it down and rattle is now GONE.