I wouldn't worry about documents changing between now and the audit date; the auditor should be aware of that possibility. The below extract is from the BRC FS Standard (page 5 of Interpretation Guidelines) though it leaves the area of which "information" is reasonably requested fairly open. Still worth clarifying with the CB though to confirm.
WHAT TO EXPECT ON THE AUDIT DAY(S)
The auditor/certification body shall have confirmed to the company the time of arrival on site and may have provided an outline of the plan of the audit schedule. The duration of the audit, although planned in advance, will depend on the activities on the day, but it may be shortened by a well-organised site and information provided in advance as requested by the certification body.
The auditor will start with an opening meeting, which all the relevant company personnel (including the most senior production or operations manager on site) need to attend, to outline how the audit will be undertaken. This will enable agreement and organisation in terms of:
- staff who need to be available to discuss specific aspects
- documents that need to be provided
- rooms that need to be provided (e.g. consider where records are stored and how they can be supplied to the auditor)
- logistics to ensure that equipment, such as protective clothing, is provided.
The auditor is likely to require background details on the company and the process before any site tour, and may therefore look through a number of documents, including: