A, I actually do still believe your h misses home and one day may want to return. If he didn't miss being around you and your children and yes, even the residence, he wouldn't come there. He's still very much attached to all of you.
As for the phone call, I wouldn't put much stock into it. If the caller wouldn't tell you their name, truth be told, it was a call to stir the pot up a bit. You can't be sure that the MOW or your h didn't do it, but then again, it could have been someone trying to push your buttons to see just where you are at this time. Game playing is another one of those habits I learned later in the crisis. They will put others up to call and leave strange messages, so, do not put a whole lot of thought into that call. As for the new shirts, he may have treated himself to some Father's Day sales. You can't assume anything w/these people when they are in crisis.
If and when the time comes, he may want to return, only you can decide whether or not you will want to try again. He may take entirely too long to come through the crisis and by then, you will have moved on completely or have met someone else. Or, on the other hand, he may not come completely through and want to be just friends and nothing more. He's still very "fresh" to the mlc crisis and the future if too far down the road to say he's stuck forever. So, until more time has passed, let's leave him in the present and allow him to muddle through his crisis on his own. Let's keep the focus on you and your family and pray that the future will be kind to him.
Enjoy your week!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.