If there have not been ample reports of the precise model, look for postings about chips in the same line. That is the method I usually use but say newegg shipped your preorder earlier than even reviewers had a sample. In this situation, I would treat it as soldered as you really don't know whats under the lid. When you set up razors and suspend by a couple of bricks like I did with my Q6600, naturally the weight should pop it apart if its garden variety TIM:
If it does not, hit it with a butane torch, I got a handy pocket size one from Amazon for like 15 bucks. Go right for the center and it only takes a few seconds. Give it a rest in between bouts so the silicon isnt damaged and you should see some delicious transistor beauty.