Invisible NPCs can have many uses. You can use them to trigger events, or put a weapon graphic on them and have them be invisible with floating weapons like the invisible men in EQLive. There are lots of different uses for them.
One way I use to find NPCs other than using the database and MQ (comes in handy for Admins too), is to /target <name> them. You can target them with that command if you know their name by using underscores in place of spaces. If they are too far away to get the target, it won't show up in your target window, but you can still use #goto to get to them. Or, you can use #summon to summon them to you.
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