delete_ghost_assets.py

import requests

# this url is to your console API endpoint
url = "https://<console IP>/api/3/assets/search?size=500&page=0"

# quick and dirty, stores creds (you can use cyberark's api to pull down creds)
r = requests.post(url, auth=('nxadmin', 'nxpassword'), json={"filters": [{"field": "operating-system", "operator": "is-empty"}, {"field": "host-name", "operator": "is-empty"}], "match": "all"}, verify=False)

assets = r.json()

# loops through every asset pulled back that hasn't been scanned and deletes it
for i in assets["resources"]:
    asset_id = i["id"]
    url = "https://<console ip>:3780/api/3/assets/" + str(asset_id)
    requests.delete(url, auth=('nxadmin', 'nxpassword'), verify=False)