I don't know that the station ever had an agency. It could have possibly served as an enclosed covered shelter only, like the platform-level waiting rooms at Jamaica station. (Are they still up there, complete with heaters?)
If CLP did have an agency, it was closed by 1940, when the ticket office hours were listed in the back of the LIRR employee timetables.
Country Life Press was not listed. My next earliest ETT is 1935 and there is NO listing of ticket offices therein.
So, if there ever was an agency there, it was gone by 1940, and, most probably, a lot earlier than that, when passenger service was discontinued between Valley Stream and Mineola. Remember, the stop was originally designed as a service for the employees of Doubleday, Page and Co., Served the same purpose as Landia station did. I can't see the LIRR keeping an agency open just to sell tickets for employees of one company. But that's only a wild guess!!!
The area wasn't always as residentially built up as it became in later years. It was pretty empty back then. People who lived in Garden City took the train to and from Garden City depot.
Prior to CLP opening on May 25, 1913, employees of Doubleday, Page & Co. were dropped off at "HC" tower, by trains traversing between Mineola and Valley Stream and vice versa. General orders in the ETT of the time instructed train crews to drop passengers for Doubleday, Page & Co. at a designated platform by "HC" tower.
Dave