"In your box" in Engpsh means "在你的盒子里" in Chinese. This phrase is not a common expression in Engpsh and does not have a specific origin.
Here are some example sentences using the phrase "in your box" in Engpsh:
"I left my pen in your box, can I have it back?" (我把我的钢笔放在你的盒子里了，能把它还给我吗？)
"Is there anything interesting in your box?" (你的盒子里有什么有趣的东西吗？)
"I put all of my old photos in your box for safekeeping." (我把我所有的旧照片都放在你的盒子里以保存。)
Here are some example sentences using the phrase "in your box" in Engpsh:
"I left my pen in your box, can I have it back?" (我把我的钢笔放在你的盒子里了，能把它还给我吗？)
"Is there anything interesting in your box?" (你的盒子里有什么有趣的东西吗？)
"I put all of my old photos in your box for safekeeping." (我把我所有的旧照片都放在你的盒子里以保存。)