Overview
This article explains how to obtain Duckov’s Key Case. This item is the highest rarity and can store multiple key-type items. Among keys, there are also ID cards, and when running J-Lab loops, you need to carry many ID cards. This item shines in such situations.
Note to Readers
This article has been machine-translated from the original Japanese. For the most accurate content, please refer to the Japanese Original version.
What is a key case?
- Item that can store 8 types of keys
- Rarity 6 (Highest Tier)
The key case can hold up to 8 keys or ID cards. Its rarity is 6, the highest difficulty level shared with graphic cards and special ammunition.
How to Obtain Key Cards
- Search: File cabinets, etc.
- Purchase: Black market
- Purchase: Farm Town’s mysterious merchant (added in v1.1.6)
Here’s how to obtain key cards. The most common way is through exploration; they tend to be found in file cabinets and possibly clothing items. They can also occasionally appear in the lineup at the black market, where you can acquire them.
Available from v1.1.6 via the Mysterious Merchant
The Mysterious Merchant in Farm Town now sells Key Case.
With the Ver1.1.6 update on November 6, 2025, the mysterious merchant in Farm Town will now sell it. This is a tremendously welcome update, and you can purchase it for around $100,000.
I’ve checked with the black market dealer several times, and it’s always listed as the first item in their shop. It might be a guaranteed sale. If I’m mistaken, I’ll correct it later.
Uses for a Key Case
- Daily Use
- J-Lab Loop
- XO Key Room Loop
The key case holds multiple keys, alleviating bag space pressure early in the game. With so many key types and difficulty tracking which ones you’ve acquired, installing a MOD makes things clearer—use this as a reference.
J-Lab Weekly
- J-Lab ID Card Red
- J-Lab ID Card Yellow
- J-Lab ID Card Blue
- J-Lab ID Card Green
- J-Lab ID Card Black
- J-Lab ID Card Purple
- (J-Lab Access Level 2)
- (J-Lab Access Level 3)
J-Lab has six rooms requiring ID cards. These rooms contain blueprints that are essential for crafting valuable items. Even after obtaining a blueprint, the ID card remains valid. A key feature of these various ID card rooms is that valuable items are more likely to drop directly. ID cards can be used multiple times and last forever as long as they aren’t lost.
The downside is that without a key case, ID cards alone can fill up all six slots in your backpack. Since ID cards are valuable, storing them together in a key case and placing that in your support dog’s bag offers the advantage that even if you get defeated during exploration, all items will be returned to your player’s base.
Have the support dog carry the key case.
Please place your key case in the support dog’s bag. While the key case itself isn’t heavy (the support dog’s bag ignores weight), its contents are often valuable, making it one item you wouldn’t want to lose.