Returns property is
| "commerceGhostItem"
| "daycareInstructorItem"
| "doctorBagQuestItem"
| "dolphinItem"
| "guzzlrQuestBooze"
| "implementGlitchItem"
| "muffinOnOrder"
| "rufusDesiredArtifact"
| "rufusDesiredItems"
| "shenQuestItem"
| "trapperOre"
| "walfordBucketItem"
| "_cookbookbatQuestIngredient"
| "_dailySpecial"
| "_pirateRealmCurio"
Whether the supplied property has an Item value
Determine whether a property has an Item value