[quote name='Rusty23']If a CAG acknowledges a redemption, it isn't lurked, is it?[/QUOTE]
No, because that doesn't fit the definition of a lurker. A lurker is someone who reads a forum but doesn't post, but it has a more negative connotation here because of the lack of courtesy (covering both not thanking someone for a code and not giving others a heads up to not bother trying to redeem a code).
Codes still get lurked in the drop club. You need to be a member of the group to be able to see the posts, but there's nothing forcing anyone to say they redeemed something. From my last drop of 20 Gears Judgment paintball weapon skins there, 12 have been acknowledged, 5 or 6 were used without acknowledgement and 2 are still active. One person posted a thanks, but didn't make clear if they redeemed one of mine, the one you dropped or were just making a general thanks for the drop. None of the other codes posted after 3/14 have been openly claimed, though someone posted they'd all been used. I didn't check any of them myself because I'm not interested in them.