You have to post pictures to get an answer, but the most definitive single aspect I have found for the PM2 knives is the indents on the liners. Spyderco leaves tooling marks on all PM2s produced in the Golden plant when they make them, and I have yet to see a fake that has those marks. They are prominent and have been discussed on the forum.
On the TI Millie there is a similar tooling mark on the liner lock plate. Other than those marks, there are many other tells, but the best counterfitters are quickly knocking those out. The edge near the plunge, the texture of the G10, the roll marks (in one case the fake didn't have a space in between 2 words, on others the Spyder is etched differently), the way the plunge starts at the spine, and the millng of the liners - also the fasteners and the small details of how the fasteners are attached to the liners. SOme small details change between Spyderco runs - the best defense is to study hard and look at as much evidence as possible. I am confident all my SPydercos are real, but at one point I have questioned most of them because of Spyderco's own inconsistent finish. Proving a fake is not something I would leave to a single aspect.
