IAH valet pickup by someone else

Was wondering if anyone has dropped a car off at the IAH valet parking and had someone else pick it up and how you did it.

My wife and I will be flying out of IAH and one of my family members will be flying in the day after we leave. I was hoping to be able to take a picture of whatever valet tag / card they give us, and text that to my family member so they can pick the car up with that when they arrive.

Seems like it should work.