This pretty much answered my question.
Run a MINISCAN and by turning these on I can see that the LAN MAC is being stored.
You don't stand much of a chance of "seeing" a mini-scan with the naked eye, as they're 1 KB, and get processed as a priority by the Inventory Service.
The way to check what's going on via scanfiles is this.
1 - Open the 32-bit Console on the Core.
2 - Go to CONFIGURE => SERVICES
3 - Select the "Inventory"-tab on the new window.
4 - Click on the "Advanced Settings"-button.
5 - Find the line "Store Scans" and set the value to "1".
6 - Click "OK" to close the settings window.
7 - Click "OK" to close the Service Configuration window.
NOTE -- you'll be prompted for a restart of the inventory service to apply the change
You'll now notice a subdirectory under "\\YourCore\ldmain\ldscan\" called "storage" -- ALL incoming files (scn / ims) will have a copy dumped into here. I'd suggest doing this during a known quiet period, as this can eat quite a bit of I/O at the wrong time of the day.
This will give you a better idea of what's going on regarding incoming mini-scans and their contents .
LANDesk EMEA Technical Lead