Custom 1 time NPC

[Maceblade]

This may be an odd request, but I was looking at creating an NPC that hands out a reward to the first 10 hails and then depops forever, however I have no idea how to write it.

The only way I know how to do it is to create 10 seperate npc id's all controlled by triggers, when #1 is hailed it depops and spawns #2 etc and once #10 is hailed he depops forever. The only issue is I have no way to keep one person from doing multiple hails unless I can have it check for the item in inventory first.

I guess I was just looking to see if someone had an easier way to do this.