Google has released the IMM76K factory restore image ROM for the Verizon Galaxy Nexus online. This is particularly useful for users who look to experiment with their device.
There are many users who flashed custom software on the nexus and carriers don’t allow them to install the official update as it voids their regulated warranty norms. However, with these posted files, anyone who has flashed custom ROM will be able to flash the official Android 4.0.4 version.
The Sprint ROM‘s that are provided “for reference only” has all the files that you may need to code the ROM and make it running.