First time at the park for me and my kids and we g...

First time at the park for me and my kids and we got rained out on the 22th of June. I came with a group of co workers and their families as well. Also was the first time I was able to have my kids out of the state and been planning events with them for the summer. This was one of the events planned and got rained out two and half hours into it. Had to wait an hour to get rain check tickets and after waiting I was told that I could not get it because i didn't have any proof of purchase into park but the stamp on my hand and the key from locker rental with me. Other members from my group received rain checks but for some reason I could not. Our office manager had all the tickets with her and had left. Either way, if you were in the park and got stamped or rented a locker. That should of been proof enough. Not happy with that.