On this page of the guide to RE 4 Remake you will find the answer to this question.
Where is Storage located?
To find Storage, you mustapproach the typewriter.
They are most often located at Merchant’s, but they can be found in other places as well.
Then, after interacting with the machine, select Storage.
How to use Storage?
On the right is your case, which contains weapons, ammunition, and items in your possesion.
Note, you’re able to store manually weapons and their accessories and healing items.
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