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Here is a reply from a staff member of the Office of the Federal Register:
"There are no preambles in the Code of Federal Regulations (CFR). Preambles are found in rule documents that are published by the agencies in the daily Federal Register. The rule documents contain regulatory text and instructions on how the agency is amending the CFR.
The preamble can be found in the beginning of the rule following the subject in the document headings and prior to the regulatory text. The preamble explains the basis and the purpose of the change(s) to the CFR that is being made by the rule. It arranges the basic "who, what, when, where, and why" for the reader's convenience."