They do not publish printing numbers anywhere that I am aware of, and anyone you ask will come up with their own guess but not reliable.
The theater folks I know, got an even split of the normal allocation. So if you normally get 10 posters, you would have gotten 5 of each on this one, not 10 of each, and more than likely you had to have a play date.
Keep in mind this was a Focus film and they were not heavily dishing out posters at that time and really still don't.
I am surprised to hear you say that. Focus must be targeting a specific theaters, as my friend's place gets many more Focus posters than from just about any other studio.
Using number of screens (other than say 50 screens vs. 1000) is nearly useless in determining print runs.