Can you drop off resupply buckets instead of mailing them?

Hello,

I just secured a permit for the JMT NOBO starting from cottonwood pass on August 10th. I think this does not provide me with enough time to ship out resupply boxes. I am from Northern California so I will be driving down to the trail head and was wondering if it was possible to drop off the buckets at the resupply points instead of mailing them?