you need to get to know the customers a bit better,
most of ours will let the guys have the scrap and say nothing.
sometimes its a condition of how we even work, eg, on re-wires the guys get the cable is a part of the deal I have with the bosses.
I actually done a night job a while back where the sloumy was worth more than the pay! and that was the condition I done it, was to keep the scrap, 70mm 4c SWA X 600m.!