Double Bass Fake F holes? Feedback blockers?

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Can someone point me to a TB thread discussing f hole anomaly in this photo? This player was with Wayne the train Hancock in Newport, Ky the other night.
 
seriously.

was this guy playing with a band that had 2 drummers and full stacks!?!?

i've played some pretty loud places and never needed to put foam behind the tailpiece and cover the F-holes.


I don't know... I couldn't make the show. My guitarist/BL sent me the photo, and i wasn't sure what I was seeing. I've since learned more; see also more TB discussion here:

putting foam in f-holes to reduce feedback