So I just did this recently. I spent way too much time separating the case at the seam with a box cutter. If I had to do it again I would use a dremel wheel and just focus all my efforts at the seam. There is plenty of clearance as the transponder is at the bottom. After that I kept widdling plastic...

It takes a lot of time and patience. Once the halves are separated you will see how much plastic is holding onto the capsule. I took a sharp box cutter and scraped away plastic one layer at a time. It took hours. Always cut away from the capsule, not towards. Just in case you slip. There was minimal...