Further investigation, involving the invaluable railway-exploration tool that is Google Earth, reveals a possible amazing survivor. The Ballyclare paper mill sidings were quite extensive and gave direct access into what appears to be a stone-built shed, marked with a white arrow in the original view. I believe this shed still exists, much extended, and I have also marked it with a white arrow in the recent Google Earth screen grab - it is also viewable on Google Street View (3rd picture). This seems to be the only surviving building from what was quite a large complex and if so, it represents a fascinating link to a distinctive operation on the County Antrim narrow gauge railways.
Definitely on the list for the post-virus explorations.
Note: The original photo dates from 1929, one year before the cessation of passenger services on the Doagh extension of the LMS-NCC, which is visible at the bottom of the picture.