I ordered from eBay Cadillac key blanks that have the necessary VATS resistance pellet. I didn’t realize most professional locksmiths will not make you a copy if you don’t mind the blank from them.
I went over to the local ACE hardware store and asked the workers if they would. After a couple of turn downs an employee was found that had the skill set to cut the key. It worked out great as this person was able to make copy of both the ignition and trunk keys. I had 2 sets made, the cost was $6. You can’t beat that deal!