I could imagine some parents bringing in a tub of parts just because they’re not being used … but they might not want a giftcard to buy more lego.
At this point, do you know what happens to the parts that are turned in or do you just ship them back in the delivery truck?
I doubt LEGO could resell these parts so they would have to be donated. Hopefully they would go to schools in need, especially in developing nations.
If LUG support boxes start showing up with crayons, instruction pages, hairclips and Mega blocks, we’ll know where the buy-back boxes went. 😀