Most of my suggestions are tabletop items, if you're not against using them

They could go on barrels or on the ground!
You could add some more 'pillaged treasure' like:
-Crowns (the silver treasure one, the two 1mil crowns, even Peach's!)
-Maybe some small gold items like gold bars, plates, or the candlestick
-Some expensive items like the ring in a box?