Well, my reading comprehension status took a hit on that last reply. Allow me to modify.
I don't have a clue. LOL Seems that the airport securities/customs and all would treat the computers, be they laptop or desktop the same. But I have no clue.
I'd be very careful if you are looking to use the LBC box to send. I have them sent to me every year and before moving here I sent them. But, I'd just get the biggest box, pack it, and send it. Sometimes the boxes come squished and all. So they are not handled with the greatest care. Maybe they have a whole "fragile" status thing going, but even then, I still wouldn't trust the locals here to notice or care about such stickers on the boxes. But, again, it's all guesswork on my side.
I suggest you just call or email someone from customs. I'm sure if you google enough and search enough you'll be fine. I'd ignore telling them the costs and all and just tell them it's your personal computer and you don't like laptops...or something.