I'm not sure if they're particularly trying to keep it secret, so have some hints: no coats but plenty of textiles, building in middle of roundabout, good chow across the street.

But a professional outfit, and anybody with 50Th+ (9+ SP30, 30+SP20, 35+SP10 if they take those) around becoming less profitable for them might find it easier to sell them altogether than to try and squeeze individual sales.