Detecting if item exists in map?

I set certain items so spawn in the map like 15% of the time. I need a trigger that determines whether or not that item exists on the map, so I can use my radar item to ping its location.

To narrow it down, the items I am checking to see if they exist, are any item with the classification 'Artifact'

Why not just make a global boolean "exists" and if you create it set it to true, then in the ping trigger have the condition be exists equal to true.