Okay, I was just mucking around in the first world you face the Aztecs in after I'd won the land...you know, peeking around for funny/interesting things. And I found one. On the Isle of Nymphs (the one you can to the quest for) there is a box. It is by one of the large rocks on said island. I didn't notice it before I completed the quest, but then I wasn't really looking. I like to occasionally pick up pots and things and put them weird places (the top of a hill, something funny like that) so I grabbed it. La dee da dee da...
I plunk it down in my city and everyone FLIPS OUT. Not like running and screaming, but they cowered a bit and then quickly walked away. 'S' for information said they were all "Avoiding Something". This something was obviously the box. When I grabbed it again they all did that 'thank you' little prayer bow they do...Very odd.
Another thing I decided to do was set it out in the open, and see what my creature thought. I grabbed the leash and highlighted it...it said 'Build'. Not 'Inspect'. So I tried to get him to 'build' it. He'd run up to it, look a second, and go do something else.
I don't really know what can be done with said box, but it's an anomaly that I was curious if anyone else had encountered. I'll be hopping onto my game and grabbing some screenshots here in a moment. Thanks for any info!