apt-file finding files that are not present in pkg

[DiagonalArg]

$ apt-file update

$ apt-file find aic94xx | grep seq
linux-firmware: /lib/firmware/aic94xx-seq.fw

$ apt-file list linux-firmware | grep aic94xx
linux-firmware: /lib/firmware/aic94xx-seq.fw
linux-firmware: /usr/share/doc/linux-firmware/licenses/LICENCE.aic94xx-seq.gz

$ apt-get install --reinstall linux-firmware

$ find / -name "aic94xx-seq*"
/run/udev/firmware-missing/aic94xx-seq.fw

$ cd /var/cache/apt/archives
$ find . -name "linux-firmware*"
linux-firmware_1.79.18_all.deb

$ dpkg-deb -c ./linux-firmware_1.79.18_all.deb | grep aic94xx
(returns nothing)

I have checked online:
http://packages.ubuntu.com/wily/linux-firmware

that firmware doesn't appear in any of the more recent linux-firmware packages, either.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: apt-file 2.5.0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-97.137-generic 3.2.73
Uname: Linux 3.2.0-97-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.14
Architecture: amd64
Date: Fri Jan 8 03:57:46 2016
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: apt-file
UpgradeStatus: Upgraded to precise on 2012-06-17 (1299 days ago)