I would guess that the >2000 ones are propably birth dates of some of the developer's children
Edit : someone asked this question on stackexchange : http://gaming.stackexchange.com/questions/63374/what-does-th...
Re:Fez soundtrack contains hidden data
by Impossible on Friday April 20, 2012 @05:49PM
(#3869950)
As far as I know the only developer on the core team with a kid is Adam Saltsman, and his kid was born in 2011. I think all of the team members are young enough that they would have been teen parents (12-16) if they had kids born in 2003 or 2005 :).
57 year olds working alongside 7 year olds. Nice to know they don't discriminate based on age.