Same with Ford. And while I do think the addresses should be returned, they should get market value or above for them. We should not punish companies for buying into the future, which turned out to be a great investment.
Alternative view - those addresses should not be "returned". They're owned. I hope hoarders will get blocks as large as they can so that we experience real shortage and start seeing the first ipv6-only services.
They probably got a /8 early and gave each regional office their own /16, so they'd have to unpick all the addresses they're currently using before they could sell off any.