We have a lot of ornaments that are released from Melody's box. The chances of getting a new item from a box that randomly gives you an item out of like 300 items is pretty slim, especially since the items are weighted a bit. I haven't made the cat items super rare to get, but they aren't on the super common end of things, either. It's only been three hours since their release. Give them a little more time. :)

Again, we have a lot of items coming out of those boxes -- think of it from a math stand point. I've opened about 100 and gotten almost a different item from each one. I think I've only gotten two doubles from them. Give it a few days and you'll see some in shops etc.