Picture the box a new pair of shoes comes in: cardboard, rectangular, a lid that lifts off, and inside it exactly enough room for two shoes and nothing more. Hold on to that last part, because the whole word turns on it. The box is not just small — it is cut to fit one thing precisely, with no space left over. That is why it is so useful for keeping little things, and why handing someone that shape and calling it their home is a complaint.
From the word’s history
The packet gives the plainest possible origin: shoe plus box. Nothing is hidden inside this word — the two halves say what it is, which is worth noticing, because the second sense does not come from any new root. It comes from taking that same small box and holding it up next to a place where somebody lives.
證據給的來歷再直白不過：shoe 加 box。這個字裡沒有藏東西，兩半合起來就是它的意思。這一點值得留意，因為第二個用法並不是從別的字根長出來的。它只是把同一個小盒子拿起來，比到某個人住的地方旁邊。
Wiktionary, "shoebox"
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