you just need to add one more column to your item template
Column name : searchable
Type : TINYINT
Length : 1
NOT NULL

To select which items to be requested simply type 1 or 0 in the searchable column
where 1 means true
and 0 means false
The items that have 1 will be found by the npc
The items with 0 will be unsearchable.
So you can use it in a fun server and you can secure your donor or a staff items as well just put 0 or higher quality then 6.

This code is not originally mine i just edited it from arcemu to trinitycore.
I don't know who made it so i can't give them credit but i hope you will all enjoy it.