The monolithic try-in submitted to you and the patient should be treated as a “throw-away” device.
Be warned: a notable percentage of patients will want to wear the try-in out of the office. This is completely acceptable, but if there are any occlusal changes on the monolithic the device must be sent back to the lab to record the changes for the final. If, however, the denture is sufficient, the patient can keep the device for a small upcharge.
Practice “Sharpie Dentistry”. Mark midline and other changes and make notes on the Rx and return to the laboratory for any corrections.