In thinking about where they were printed, I also was thinking about where the posters were advertised. I had a clue that they looked similar in size, shape, and amount of information as the advertisments on the front of streetcars around Vancouver at that time.
The dates on the posters are all in the same narrow time window; I imagine the cabin builder might have gotten all the posters in one or two batches from the nearest streetcar station.
Not all were printed in Vancouver, but the posters for the Empress Theatre were all printed at A.H. Timms print shop (on the posters, indicated as Timms Show Print Service). In the 1920's, the print shop was located at 228 East 14th Avenue, see photo below:
I was so surprised to see the kind of street in this picture: the dirt road and the humble building look like they are out in the countryside.
While browsing the archives, looking for photos of Vancouver in the 1920's, one photographer's name is attached to most of the photos: Philip T. Timms. While A. H. Timms went into the printing industry, Philip was out on the street taking countless photos. Notably this mesmerizing photo of A.H. Timms and his family outside of their home at 240 East 14th Avenue:
Most of Philip Timms' photos from this time period are crisp and somewhat haunting. In this one there is a mark on the negative that caused a ghostly wisp to appear in the darkened doorway behind the hood of the car. The state of the street again surprised me in this photo - it looks like the car is driving on a rutted lawn. Unfortunately the house no longer stands at the address on 14th avenue; there is nothing but low rise apartment buildings on the street now.