Can I leave luggage at Dujiangyan panda base's ticket office?

1. We must carry luggage to panda base. Can we ask officer to leave them at ticket office or tourist center or somewhere? After we finish touring we will take them back to CD.
2. If we do not take hi-speed train back to CD. Can we take public bus about 5.00-6.00 pm? and which terminal bus stop at Chengdu?
Thanks again