Okay
No information given, where did you look for the items?
Did you read the manual?
I bet you looked into the /etc/openhab2/items/ folder right? 
If you create Items, Things, Groups etc. via PaperUI they get stored in a JsonDB
You can create Items via. PaperUI AND in a text file, they can work with each other, but you can only edit PaperUI Items via PaperUI, you can not edit text file config via PaperUI.
This has been explained numerous times in this community.
You should consider reading this