– Could the damage have happened after collection?
No. I saw the scratches on the lowers and thought 'the forks are secondhand-scratches on lowers isnt a biggy'.
The scratches are consistent with being on a bike/fallen down the side of a wall.
– Could I have propped the forks on their own up against a wall and the same damage happened? No- the wall would have to be a pigmy-wall. i.e. very small for the angle/fall wouldnt it?
– Could I have dropped them whilst carrying them? No- they would have to have slid along the floor on their side. If I dropped them they have have landed and bounced. The scratches are all in the same direction.
It was the same evening I recontacted the seller.
I'm guessing here but it its either wall-damage or a bike rack. Where another bike has been rubbing against the forks?
I've contacted the seller with a compromise.