Rental Cleints - Ad & ticketing policies

Our rental clients are instructed to use our ticketing path (graphic treatment including our facility logo, web address, and box office phone no.s) in their print ads.

We're finding many do not use the graphic treatment, but pick & choose elements from it at their discretion.

Have you run into the same issue?

Do you give your box office rental clients a specific graphic file to incorporate into their ads?

If not, how do you specify that they communicate your venue/your box office as the key ticketing source?