2. Publish a list of these transactions every day publically, especially here on the forum
3. Sue everyone that I can get hold of for concealment of stolen goods. (You can always know who got your stolen coins through blockchain)
Good luck tracing continuously those bitcoins through multiple mixers, you will never be able to keep up to date with the addresses that hold those coins. Another big problem is that you will need to inform an exchange before the thief gets his coins out of there and more importantly find out when those coins are hitting an exchange address. The next one is that you will never be able to sue an exchange just because you publish a list on a website, you need to inform them in an official letter of those stolen goods, and only if they refuse to lock them can you go an sue them, otherwise any lawyer will just laugh in your face, including the ones you want to hire for this.
Besides, there are thousands of ATMs in the world, one tx, 1 confirmation, and the thief can extract 5k euros at a time and be gone, how much do you think fake papers costs to avoid ID requirements? And it doesn't even stop there, he could simply exchange the coins OTC or via decentralized exchanges for other cryptos or money, how would you be able to tell the coins are still owned by the thief?