Frame created with tcolorbox adding the white holes

Question

Considering this question Add a crease in the lower right corner with a shadow with the answer of the nice user @Ignasi, and the recent comments of @John Kormylo, @Cicada and @Ignasi on the use of overpic,

\documentclass{article}
\usepackage[most]{tcolorbox}
\usepackage{pifont}
\newtcolorbox{mybox}[2][]{%
    colback=teal!10,
    coltitle=black,
    colframe=teal!30,
    fonttitle=\bfseries,
    title=#2, 
    sharp corners,
    rounded corners=southeast,
    arc is angular,
    arc=3mm,
    boxrule=0pt,
    enhanced,
    overlay={\node[font=\Huge, text=cyan!70!black] at ([yshift=-4mm]interior.north west) {\ding{228}};},
    underlay={
        \path[fill=tcbcolback!80!black] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
        \path[draw=tcbcolframe,shorten <=-0.05mm,shorten >=-0.05mm] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
    },
    drop fuzzy shadow,
    #1
    }
\usepackage{lipsum}
\begin{document}
\begin{mybox}{An example}
\lipsum[1]
\end{mybox}
\end{document}

if it is possible, easily, to edit the MWE (with the same structure of the first image) adding an increase of the crease to the bottom with the white holes like in this image without to change the format and the ding symbol:

Answer 1

Here tcolorbox option interior titled code app={<tikz code>} is used.

\documentclass{article}
\usepackage[most]{tcolorbox}
\usetikzlibrary{calc}
\usepackage{pifont}
\makeatletter
\newtcolorbox{mybox}[2][]{%
    colback=teal!10,
    coltitle=black,
    colframe=teal!30,
    fonttitle=\bfseries,
    title=#2, 
    sharp corners,
    rounded corners=southeast,
    arc is angular,
    arc=3mm,
    boxrule=0pt,
    enhanced,
    overlay={
        \node[font=\Huge, text=cyan!70!black] at ([yshift=-4mm]interior.north west) {\ding{228}};
    },
    underlay={
        \path[fill=tcbcolback!80!black] ([yshift=3mm]interior.south east) -- ++(-0.4,-0.1) -- ++(0.1,-0.2);
        \path[draw=tcbcolframe,shorten <=-0.05mm,shorten >=-0.05mm] ([yshift=3mm]interior.south east) -- ++(-0.4,-0.1) -- ++(0.1,-0.2);
    },
    interior titled code app={
        \path[save path=\mytcb@dots]
          let \p1=($(interior.north) - (interior.south)$),
              \n{r}={\kvtcb@leftupper+\kvtcb@boxsep},
              \n1={int(scalar((\y1)/5mm))},
          in
            ([xshift=.5\n{r},yshift=-\n{r}+2.5mm]interior.south west)
            foreach \i in {1, 2, ..., \n1} {
              ++(0mm, +5mm) circle (.23\n{r})
            };
         \begin{scope}
            \clip[use path=\mytcb@dots];
            \fill[black, opacity=0.25, use path=\mytcb@dots];
            \fill[white, transform canvas={xshift=.3mm,yshift=-.3mm}, use path=\mytcb@dots];
         \end{scope}
    },
    drop fuzzy shadow,
    #1
}
\makeatother
\usepackage{lipsum}
\begin{document}
\begin{mybox}{An example}
\lipsum[1]
\end{mybox}
\end{document}