Note the OGA topic you linked to states "I hope people understand that OpenGameArt.org isn't directly involved."

That being said, the bundle consistend of assets from a series of newgrounds games:

• From HalcyonicFalconX, the soundtracks from
  Adventure Story, Bullet Heaven and Epic Battle Fantasy III.
• From Jimp, art & animations from two never-before-seen games.
• From NutcaseNightmare, soundtracks and the full source code
  from Reimagine :The Game:.
• From Stratkat, two videogame music albums
  and a collection of music loops.
• From Kenney, the debut of his Platformer Deluxe Tileset Pack.
• From Mindchamber, art from Heavy Terror Machine,
  Nightstrike and Da Pink Knight.

A few links may no longer be valid. Some of the contributions from JIMP, NightStrike, and Kenney can be found here on OGA. The rest are not on OGA (or they are but I could not find them anywhere in the archive)

Here is my own full copy of the bundle: http://www.medicinestorm.com/LLC/MedicinesArchiveOfOpenBundle.zip (~580 MB) I haven't really looked at the content much. If something is incorrect, corrupted, or out of date, I won't be able to help much. Also, this pack is on my own domain, so if bandwidth becomes an issue, I may have to discontinue hosting it myself. 

Hope that helps! :)

At a cursory glance, some of the links via The Wayback Machine work for the open subdomain: https://web-beta.archive.org/web/20150920020628/http://open.commonly.cc:...

The garage Subdomain does not have working download links (https://web-beta.archive.org/web/20131113144333/http://garage.commonly.c...) but lists:

* Bombermine:

• Spritesheets, scripts, & special effects from a Bomberman MMO.Voted Best Web Game in the Mozilla Gameon contest.

50 Shapes of Yay:

• A pack of particle effects for Unity, with ~50 vector shapes.

* Tilted Trees:

• Isometric tiles for a forest terrain.

** Reimagine Soundtrack:

• The original, orchestral soundtrack from Reimagine :The Game:.Voted Best Sound for the Mochi Awards. 

Music of Madness:

• Creepy music collection from multiple artists.Heard in Bleed For Speed.

* Sprite Club:

• Animated sprites from multiple artists. Seen in The Juice Box, Vahiy, & Decayed of Zombies.

Iconoclast:

• An assortment of 100 pixel art GUI icons.

Pixel Paintbrush:

• Photoshop brushes for making isometric pixel art.

EZ Animate:

• A Unity package for simple 2D Texture animation.

* Some rendered sprites are at this Github repo: https://github.com/redien/The-Open-Bundle-Sprite-Sheets/tree/master/output

** This was also part of the Open Bundle.