Question Trigger help needed - firing only if the mob has item in inventory?

I've tried this sevem different ways but I can't seem to get total success.

I want the players to have to buy the storyteller a beer in exchange for a story. I'm trying to get the storyteller mob to check its inventory first to be sure there's a beer in there and if not, tell the player they need to buy him a beer before he'll tell his tale. I've tried:

if %heldobj.vnum% == 104
if %obj.vnum% == 104
if %self.vnum%104
if %actor.has_item(104)%
if %inventory.vnum(104)%
if %self.contents.vnum% = 104
if %has_item(104)%

Now I know some of these choices I tried are silly, but I started throwing everything I could at this. I feel like the obvious answer is staring me in the face and I could use a fresh set of eyes on this.

Thanks much!

This morning I have tried, with no success:

if %self.obj% == 104
if %self.obj%(104)
if %self.object% == 104
if %self.object%(104)
if %self.object.id% == 104
if %self.object.id%(104)
if %self% %object% == 104
if %self% %object.id% == 104
if %self% %object.id%(104)

Does this work?

%self.has_item(104)%

Why yes. Yes, it does.

THANK YOU!

I like that you wrote down all the things you'd tried.

Well, I think that if I'm going to ask for help I should both demonstrate that I've been trying and not just asking for someone else to do something for me, and also show what I've tried so that the same ground isn't covered and someone's time isn't wasted.

I've been able to put together a lot of triggers overall, but this one had me stumped pretty hard!