Translation guide
A strongbox is a sturdy, lockable container for valuables. In Japanese, the most common equivalent is 金庫, but the best choice depends on size, material, and context.
A secure, lockable metal box or small safe for storing money, documents, or valuables.
The standard word for a safe or strongbox, ranging from small portable boxes to large bank vaults.
I keep important documents in the safe.
This safe is fire-resistant.
A portable strongbox with a handle, often used by businesses for cash transport.
I put the day's earnings in the portable safe and take it to the bank.
A small safe or strongbox, emphasizing compact size.
I hide a small safe in the closet.
A heavy, old-fashioned chest or coffer, often wooden with metal bands, used historically for valuables.
A traditional Japanese wooden chest with metal fittings, used for storing clothing and valuables; now mostly historical or decorative.
There is an old wooden chest at my grandmother's house.
A wicker or bamboo trunk, sometimes used as a strongbox for travel or storage in the past.
A small, often portable box with a lock, used for cash or small items.
金庫 is the general term for any safe or strongbox, from small home safes to bank vaults. 金箱 is specifically a cash box, often simpler and smaller. 手提げ金庫 is a portable safe with a handle, commonly used by businesses.
If you mean a modern fireproof safe, use 耐火金庫 (たいかきんこ). For a wall safe, use 壁埋め込み金庫 (かべうめこみきんこ). For a hotel room safe, セーフティボックス is common.
They packed clothes into a wicker trunk and carried it.