My kernel header is missing from the repo where else should I look? 3.18 EDGAR

[marvinharcsun]

uname -r

3.18.0-12632-g42a6df4

What Im getting is really close with
git checkout HEAD~411

3.18.0-12632-XXXXXXXX

but still not the correct one is it okay to use this one or should I look into kernel-next

net/Kconfig:373:warning: environment variable WIFIVERSION undefined
3.18.0-12632-g7696814
(xenial)marvin@localhost:/kernel$ uname -r
3.18.0-12632-g42a6df4
(xenial)marvin@localhost:/kernel$ git reset --hard origin/chromeos-3.18