Some guilds have hosted thier own scavenger hunts over the years. And those were always a nice change of pace.
With ssg now having the optional chest setup like this. They "could" add this to an existing event, or possibly make a new event. One that is not on the HC server.
An example could be:
During the Nighrs Revel time period. You could make a scavenger hunt where a player has to collect, let's say, the bones of a skeleton. And once you collect them all from all locations, you get a pick of skeleton armor skin. Or something like that.
Make the scavenger items bta, and the capability to get multiples for other characters.
Something like that.
I think scavenger ideas in general are at the whims of cost and imagination of the designer. And 1 or 2 a year on the regular servers could prove to be an added boost of enjoyment.
And if ssg needs a carrot for doing it, make it so one of the items to collect is on a pack or expansion that you are trying to sell. I know, I know, some won't like that, but honestly, isn't that the point of the game. If players want all the cool stuff, then you have to be willing to at least get the quest pack sooner or later. Cut out one large pizza, starbucks coffee, 6 pack of beverage, and pick up a quest pack today.