According to the information available ,Windows Server 2008 R2 build 7268 has been leaked on various torrent sites.This leak belongs to the pre RTM branch and has been available in the form of VHD file.

Here are the details of the build
Windows Server 2008 build 7268 X64
(the original VHD in packed RAR archive, size RAR file: 2,170,486,109 byte CRC: F7E90180, SHA1: DA5D121FFDCBCB02A127048944516AE685C41B09,
MD5: 6A5A563A1622EDD5F9CF42247FABED9F).
FILE: 7268.0.amd64fre.win7_rtm.090701-1900.server_en-us.serverenterprise.vhd
SIZE: 6,851,044,864 byte
CRC: 77301FAE
SHA1: 3AE56246B66B8EE28A65184D47E2326BDEE089E2
MD5: 29487313263A61B0DD2CBAB3DC4237DE