When is the best time to tell an owner if their dog damage your stuff?

I had three dogs dropped off today before work. The owners had said they are fine outside of their crate but were going to bring one for one of the dogs that jumps on counters. The dogs got dropped but they forgot the crate and said they could bring it later. I had to go to work and asked what the dog does if he's not in the crate to which the response was he tries to get food off the counter, no problem. They drop the crate off later while at work and I come home to having two of my doors, one being a pocket door scratched up by the dogs. If you have damage, do you usually mention it right away or when they're being picked up? This is their first day of vacation and don't want to start it on a bad note as mine has.