What Gets Added to the Database? Rules & Criteria for Additions

[HIPPEEDUDE]

One question,which maybe stupid. The original xbox had what is clased some limited or collectors editions however they had no DLC,just extras or different packaging. Should these be included in the database? I only ask as theres a couple missing(possibly more) from the database. For example there was a Medal of Honor Limited edition that came in a special package with a limited edition xbox controller(PAL)