pkg_info
está obsoleto e, portanto, sua confusão.
Na verdade, o comando apropriado para listar os pacotes do FreeBSD já instalados é pkg info
.
De man pkg
info Display information about installed packages.
$ pkg info | tail
python27-2.7.13_1 Interpreted object-oriented programming language
readline-6.3.8 Library for editing command lines as they are typed
screen-4.5.0_2 Multi-screen window manager
sdig-0.45_1 Translate IP/DNS/WINS/MAC address into port description
tmux-2.3_2 Terminal Multiplexer
unbound-1.6.1 Validating, recursive, and caching DNS resolver
vm-bhyve-1.1.5 Management system for bhyve virtual machines
wget-1.19 Retrieve files from the Net via HTTP(S) and FTP
xextproto-7.3.0 XExt extension headers
xproto-7.0.31 X11 protocol headers
Por favor, veja o wiki do FreeBSD Pkg Primer que detalha o uso do comando pkg
, e o uso equivalente do uso obsoleto Comandos pkg_ *.