Possibly, but they are 15 year old frames (and equipment by the looks of things - Square Taper K-Force anyone?), so unlikely they were there to be used by pros.
A curiosity no doubt though. Wonder who's shed they've been in, and how much dust needed to be removed.
Those are screenshots was from Perry Ap Gwynedd's insta story yesterday, so I'd say they were at least present at yesterday's finish