Sixteen years ago, I engaged the services of a researcher from the genealogical society in the area I was investigating. They consulted their database on newspaper BMD info, the Edmonton city archives (for newspapers) and visited the appropriate cemetery office. This resulted in my receiving a printout of their database for my ancestor, a set of annotated newspaper images and a copy of the relevant cemetery burial information (and location map). At the time, this level of citation information detail was fairly standard and I am in no doubt that the information is accurate.
The references are still adequate to locate the data again, with a little work on my part, but do not seem sufficient to produce the EE-style layered citations. The information does not state much detail about the repositories for the information other than their official names. I should also note that, based on the clipping photocopies I received and a knowledge of the repository, I think these specific items were taken from microfilm.
I can produce the standard EE citation relating to the physical article (layer 1), but what can I do to capture that I received the information from a specific researcher (under a case number) and then somehow note the location from which they obtained the information? (I can fairly easily check the street location of the repositories at the time of the research.)