While I can appreciate the desire to review the figure early for our benefit, if you purchase possibly stolen figures then you may be supporting thieves (I imagine that they wouldn't steal toys to sell them if people didn't buy them). I personally don't even look at reviews of toys that are out prematurely (i.e. probably reviewing figures stolen from factories). Another more ethical option would be simply to import a figure when it's released in North America and review that. Also, as griffin already said, reviews of stolen items is not permitted here anyway.

It's entirely up to you if you want to purchase this toy for yourself though (I personally wouldn't).