Film Reels?

They can be hidden in any corner, crevice, or nook. One thing I have noticed, is that they are all outside - meaning that you do not need to enter a building (save for maybe a garage with open door or two). Look behind barrels, boxes, fruit stands, alleys adjacent to shops, bottoms of exterior stairways, behind low walls near hubs/warehouses, etc.

Does that help?

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"Who's scruffy lookin'?"