This part has been bugging me for a while because it's just really nice looking in terms of a large scale greeblie. Searching what's visible on the sticker finally yielded a result this weekend: The part appears to have been produced by a die casting firm in Anaheim (which makes sense). There is an image of the part on their website -
the page that focuses on assembly.
I wrote to Hyatt Die Cast asking about the part. Here's the response I received:
So I am going to guess that WDI contracted with Hyatt Die Cast to get seconds and scrap castings for prop decoration - likely in a bulk lot - and these items were among the pieces they purchased. Still doesn't help for full identification, but it's a datapoint nonetheless.