YOU SAID:
In the box have steak in the box
INTO JAPANESE
箱の中にはステーキが入っています
BACK INTO ENGLISH
There is a steak in the box
INTO JAPANESE
箱にはステーキが入っています
BACK INTO ENGLISH
The box contains steak
INTO JAPANESE
箱にはステーキが入っています
BACK INTO ENGLISH
The box contains steak
That didn't even make that much sense in English.