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Why do latest Android Security Update firmwares have old file dates?

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I am confused about something that I think should be simple:
Monthly Android Security Updates

I apparently have to install these manually, since OTA updates fail supposedly because I run a rooted phone w/ custom bootloader/recovery.

Google has been making it a point to release security patches every month:
http://source.android.com/security/bulletin/index.html
March 2016's is here:
http://source.android.com/security/b...016-03-01.html

On that page they say:
"The Nexus firmware images have also been released to the Google Developer site.", with a link to:
https://developers.google.com/android/nexus/images

I download firmware for my Nexus5 Hammerhead MMB29K:
https://dl.google.com/dl/android/aos...y-1943f0f5.tgz

I unzip that file and list the contents:
Code:

Pvs-MacBook-Pro:hammerhead-mmb29k pv$ ls -la
total 1218408
drwxr-x---@  8 pv  staff        272 Nov 18 15:44 .
drwx------+ 28 pv  staff        952 Mar  9 10:55 ..
-rw-r-----@  1 pv  staff    3195188 Nov 18 15:44 bootloader-hammerhead-hhz12k.img
-rw-r-----@  1 pv  staff        974 Nov 18 15:44 flash-all.bat
-rwxr-x--x@  1 pv  staff        845 Nov 18 15:44 flash-all.sh
-rwxr-x--x@  1 pv  staff        798 Nov 18 15:44 flash-base.sh
-rw-r-----@  1 pv  staff  574092301 Nov 18 15:44 image-hammerhead-mmb29k.zip
-rw-r-----@  1 pv  staff  46515712 Nov 18 15:44 radio-hammerhead-m8974a-2.0.50.2.28.img
Pvs-MacBook-Pro:hammerhead-mmb29k pv$

So, my question is:
Why does Google say that the March 2016 Security Updates Nexus devices are available for download, but the files themselves are dated November 2015?

This begs more questions:
Are the March 2016 Android Security Patch Levels really in the 6.0.1 November 2015 dated files?
If not, then why does Google say that I can get the March 2016 updates for my Nexus 5 from the firmware download page?
How do I non-OTA update my Nexus5 to the latest Security Patch?

Thanks!

Pv

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