It would be in your Account Opening procedures, but not CIP since a government entity is not a "customer" according to the regulation.
As JacFSB pointed out, just from a general bank operations protocol, you want something to document that the account is authorized by the entity and the person who will be signing on the account have the authority to do so.
Account Opening procedures are going to be much more than just CIP since your procedures should outline your internal process for opening an account: i.e. forms to be used, screens and commands in your processing system, how checks are ordered (for transaction accounts), etc. CIP should be addressed in your Account Opening procedures, and the Account Opening procedures should reflect what your CIP requires - but the two are not one and the same.
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CRCM,CAMS
Regulations are a poor substitute for ethics.
Just sayin'