What does 開いた郵便受け（手紙なし） look like on Samsung?

On Samsung it is the design shipped in One UI 8.5, shown above at full size. Older revisions are listed beneath it.

When did Samsung add 開いた郵便受け（手紙なし）?

Samsung first drew 開いた郵便受け（手紙なし） in Touchwiz 2.0, released 2013年4月26日.

Samsung Electronics has shipped 26 versions of 開いた郵便受け（手紙なし）. Each is dated, so you can see when the design changed.

Samsung Experience 8.5

This is the design Samsung introduced in Touchwiz 7.1, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does 開いた郵便受け（手紙なし） look like on Samsung?: On Samsung it is the design shipped in One UI 8.5, shown above at full size. Older revisions are listed beneath it.
When did Samsung add 開いた郵便受け（手紙なし）?: Samsung first drew 開いた郵便受け（手紙なし） in Touchwiz 2.0, released 2013年4月26日.
How many times has Samsung redrawn 開いた郵便受け（手紙なし）?: Samsung Electronics has shipped 26 versions of 開いた郵便受け（手紙なし）. Each is dated, so you can see when the design changed.