2013 BRZ Rattle under dashboard (left side)

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I've got a 2013 BRZ (about 30K miles bought it new - not my daily driver).

About 4 months ago I started getting a rattle under the dashboard, just above and to the left of the steering column. Whatever it is, it isn't small. Sounds like something big. I only hear it on bumps and rough roads. (NOT a 'Ticking' it's a rattle).

I've looked under the dash a number of times, even used a 'bore scope' camera so I could really get up there. Still no idea what's causing it. I really don't want to pull the dash off (or take it to the dealer). I don't think it's steering or brake related. Would rather find out what is causing it before whatever it is falls off.

Thanks.