My lil' bucket is my prized possession. It cost me 750K on Siege. *gulp*
I believe there are now actually more buckets in existence than what was obtained from the original Hedge Maze daily. There is a Mondain's Legacy Sanctuary
quest that has a bucket as a quest item, which is the same graphic, which was turned in and thus consumed when the quest was completed. However, there was a general bug in the quest system when ML was released, which allowed you to put the quest item in your bank, cancel the quest, and keep the item as a souvenir. (This bug gave us the HoM hued spider silk cloth!). So, this gave us a brief new source for the buckets, but that source dried up as well (no pun intended) when they patched to eliminate this behavior. A shame too, because they are as cute as can be, and some deco things you just can't simulate well with other items, due to size issues.
What is insane is that these are part of the spring cleaning system. Anyone who turns in a rare bucket for a crummy 5K points in the spring cleaning system needs to be tied up in this forum so we can take turns beating them with our deco tools.
-Skylark