[Tex/LaTex] How to move this minipage 0.2 cm to right

Question

I find methods to align the vertical alignment but not the horizontal.
Code

\documentclass{article}  
\usepackage{xparse}
\usepackage{graphicx}   

% http://tex.stackexchange.com/a/88624/13173
\newsavebox{\fminipagebox}
\NewDocumentEnvironment{fminipage}{m O{\fboxsep}}
 {\par\kern#2\noindent\begin{lrbox}{\fminipagebox}
  \begin{minipage}{#1}\ignorespaces}
 {\end{minipage}\end{lrbox}%
  \makebox[#1]{%
    \kern\dimexpr-\fboxsep-\fboxrule\relax
    \fbox{\usebox{\fminipagebox}}%
    \kern\dimexpr-\fboxsep-\fboxrule\relax
  }\par\kern#2
 }

\begin{document}       
\begin{fminipage}{16em}%\textwidth}
{\small
Seller: \textbf{Student A. Masi} \\
\\
Date: 30.9.2016 \\
Local food store 
}
\end{fminipage}
\end{document}

Methods unsuccessfuly tested

• With raisebox and hfill

  % http://tex.stackexchange.com/q/16937/13173
  % these not working when applied with \width etc:
  %\raisebox{-.5\height}
  %\hfill
  

OS: Debian 8.5 64 bit
Texlive: 2016
Hardware: Asus Zenbook UX303UA

Answer 1

A simple modification (the code in the answer you refer to was meant to make the box's borders stick in the margin):

\documentclass{article}  
\usepackage{xparse}

% load showframe just to show where the box borders are
\usepackage{showframe}

\newsavebox{\fminipagebox}
\NewDocumentEnvironment{fminipage}{m O{\fboxsep}}
 {\par\kern#2\noindent\begin{lrbox}{\fminipagebox}
  \begin{minipage}{\dimexpr#1-2\fboxsep-2\fboxrule}\ignorespaces}
 {\end{minipage}\end{lrbox}%
  \fbox{\usebox{\fminipagebox}}%
  \par\kern#2 }

\begin{document}       
\begin{fminipage}{16em}
\small
Seller: \textbf{Student A. Masi}

\bigskip

Date: 30.9.2016 \\
Local food store 
\end{fminipage}

\begin{fminipage}{\textwidth}
\small
Seller: \textbf{Student A. Masi}

\bigskip

Date: 30.9.2016 \\
Local food store 
\end{fminipage}

\end{document}

Output with showframe

Output without showframe