Hey, I just sent this e-mail off to Bioware for an official confirmation, but I think I may be in possession of a beta disc of Mass Effect 1 for Xbox 360.  It doesn't play on a standard Xbox 360, I think it may require the use of a devkit. 

    * Problem description:  The disc that I purchased at a used game retailer did not play in my Xbox 360.  After purchasing another copy, I noticed that the two discs are not identical whatsoever, and the disc that I purchased originally will not load in a Xbox 360 or a PC.  I included a picture of the disc for reference and would like to draw your attention to the following points of interest.

   1. Different disc art
   2. The ring of "Xbox 360" printed around the disc.
   3. The ESRB rating listed as RP
   4. The disc's region is listed as NTSC U/C so region lockout would not be an issue
   5. The XOU number of 623.  I don't know what this is in reference to, and would also like to point out that this graphic is a holograph that appears deeper than the rest of the disc art.
   6. There is also in the small print under the disc written "Confidential unpublished work"
   7. The case that I purchased the game in is a stock Mass Effect normal release case, identical to the one on the original retail release.

All the details lead me to believe that this would be a pre-release build meant to be run on an Xbox 360 devkit, but I'm really interested to know exactly what I have my hands on here.  Any help would be greatly appreciated.

http://i1208.photobucket.com/albums/cc361/misterradon/11262156.jpg

Thoughts on what I should do with this?  I'm a big collector and would love to have accidentally wound up with a beta, but I'd like to know what's on the disc and contribute to the community as well.