Yep! The quarter mile is the distance eastward from US395 on CA136. I've used it numerous times.
Last time I used it, the prior people who opened it didn't even bother to lock it all the way. Make sure to shut it.
Your permit should be in an orange office envelope. Sign your permit with the pens in the dropbox, take the contents, and leave the envelope.
Wag bags should be in a receptacle below the lock box.