I just bought a Gleeful Mask Rucksack at the Millionare Center and one of the items inside the bag appear with this information: Item not found: sultry ladyleaf headdress Sultry Ladyleaf Headdress

idk if this is known but since I didn't see anything like it I added it.

I get "Item not found: lagoon ladyleaf headdress" too but it shows up when you click on it for some reason...

You are right, I was able to move it to my inventory but I wish it didn't say the item was not found, its confusing. :P