It was there at 11.30am this morning, and I hid it at the back, in case a collector wanted it....
It was definitely still sealed, and since this wave was just released in the last two days, there's no way (or reason) this was a swapover-and-return toy.
This is a genuine factory error.
(I was tempted to buy it myself, but $50 for a figure that won't really attract much attention or value, was a bit much to waste on a toy I won't ever play with.)