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Good question :)
Snapshot saved the deb7u16 update as part of wheezy-security in 2018:
https://snapshot.debian.org/package/samba/2%3A3.6.6-6%2Bdeb7u16/
There's a modified copy of Wheezy LTS as part of the ELTS project
(deb7u19, 2019):
https://deb.freexian.com/extended-lts/
https://deb.freexian.com/extended-lts/pool/main/s/samba/
I also see there's a copy of Squeeze LTS in the Debian archive:
http://archive.debian.org/debian/dists/squeeze-lts/
and a copy of Wheezy pre-LTS (2016):
http://archive.debian.org/debian/dists/wheezy/
but there's no copy of Wheezy LTS.
Anybody knows if there's an archived copy of Wheezy LTS/pre-ELTS?