ClockworkMod Recovery Error mounting /system! on new 100% stock Nexus 7 (2013)

I just got a brand new Nexus 7 (2013), installed drivers from the ASUS support site on a Windows 7 pc, fastboot oem unlocked the bootloader, fastboot flash recovery ClockworkMod Recovery, rebooted into recovery, and get this error:

E: Can't mount /cache/recovery/command
E: Can't open /dev/block/patform/msm_sdcc.1/by-name/misc (no such file or directory)
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: Can't mount /cache/recovery/last_log
E: Can't open /cache/recovery/last_log
E: Can't mount /cache/recovery/last_install
E: Can't open /cache/recovery/last_install
E: Can't open /dev/block/patform/msm_sdcc.1/by-name/misc (no such file or directory)

Then I tried mount /system and get:

Error mounting /system!

I had done absolutely nothing else to the device, not even activating it. Booting up regularly goes just fine so it's possibly not bricked, but I really wanted to do the mount /system in CWM for a particular reason.

Thanks for any help.

Download from this link