I think that there are a number of issues to consider.
First and foremost, if in house fire risk assessors keep finding service penetrations in their buildings, I would suggest that the key finding has to be that the organisation for whom they work, needs to review and tighten up their contractor controls, to stop the creation of unsealed openings in the first place.
Third party Fire Risk assessors are carrying out a fire risk assessments, not a fire safety audits. Audits, by their nature, need to be far more detailed than fire risk assessments, they take much more timer to complete and they usually report on the compliance status of a system or arrangement, as opposed to the risk that it presents.
Obviously, listing examples of the none compliance's that you have found in the building, will be helpful to the client/RP, but do you have the time to survey the whole building and individually list all the issues? If you start out on this route, and miss one or two issues, could that be considered negligent, would you be liable? I think that in general, fire risk assessments, as they stand at present, identify trends and behaviours which compromise fire safety, rather than each item that is not compliant. If I come across one or two issues when carrying out a FRA, I do tend to list them. However, where there are, what I consider to be, systematic failings, I list sufficient examples to justify further surveys / audits.