I would withhold the spare key. Surely, you won't get answers, from them. Do you know, if he has any addiction issues? If your ex's family, is closed mouthed, that's one way to 'cover it.' My dad and stepmum, can be closed off, to disclosing truth. One time, this summer, I happened to get lost, in the biggest city, close to me, and I drove by a hospital, that I knew their daughter, my half-sister, had been in. They said, due to diabetes, but there was a sign right under the hospital sign, stating a behavioral health hospital. That could have been for any variety of reasons, she'd landed in the hospital, when she did, not necessarily 'their story'.

I have concluded in life, I will never get a completely truthful story from them, no matter how much I desire it.

Pack what you can. He has keys. Let him, give them the keys, and pack his stuff for him. You are a few weeks away from delivery, *geesh*.