Here are several from 2012.
Gamestop Planning "Vintage Game" Sales - IGN
GameStop CEO details progress of vintage game sale initiative - Engadget
And one about their "Retro Game Vault" initiative, which I don't think ever even went into effect.
GameStop's Retro Game Vault is ridiculously stupid - Destructoid
I just think the retro collecting market is such a mess as-is that a huge company looking to step in and make bank on it is only going to f*ck it up way worse. Can you imagine what they'd consider "fair" for trade value and sale prices? We're talking about the people who give you $30 back on a brand new game trade and sell it for $4 less than a new copy. This happening is the stuff of my nightmares.