"So first they need psychic abilities to know I have an Echo. They then need to hack my home's security and compromise the manual locks. ...."
Go on and bury your head in the sand a little deeper. It will feel better. They just need to trick you into accepting a compromised Amazon delivery, starting from the Amazon warehouse. You know how many poorly treated workers there would do this for a bribe or two? This is would be cake to do, especially considering state actors like China and Russia, LOL. Heck even the NSA might be in on it too.