@crinrict You asked if this happens to a house that doesn't have a mailbox, and I guess technically you could say that.
While in the players library, the home has no need of a mailbox, it is only after the home is placed the mailbox is required, and
when it generates it is inside the home.
But I want to add that in two occasions I was moving a Sim, and before I had taken them from the home they were living in, their homes had mailboxes.
One of the homes was already fully built, and I just placed it, it was the same home they were living in, I just moved it to another NewCrest where another Sim
I wanted them to meet was. The mailbox was in the house after I placed the house.
The other home was a home in Windenburg, it had a mailbox. I made some changes to it, and saved it to my library, then saved the Sim to my library,
and then bulldozed his old house and placed his upgraded, renovated one from my library.
The mailbox was in the house.
The 3rd time it happened, was in NewCrest, after I had received a message from EA that a home my Sim was living in was created with game packs I didn't have, and
some of the things in the home would have to be removed, I decided to build her house myself, because that home she was living in, I had downloaded it from
the gallery.
Here is the thread I started after receiving that message from EA. I tracked down the house on the gallery to look at the packs the game was saying it was created with, because I thought I had most of the ones used to create the home.
https://answers.ea.com/t5/General-Discussion-Feedback/remove-packs-listed-in-creation-gallery-sims-4/m-p/9838115#M41401
Turns out the gallery was having problems identifying packs the game was using to create things, and I don't know if that ever was fixed.
After I build the new home, and saved it to my library, I made sure she was in my libary, then I placed the new home, and moved her.
She walked into the home and the mailbox was in the home. That's one of the pictures I had posted.
The 4th time it happened was when I recreated the problem. I built a small nothing home, created a Sim and placed both in NewCrest.
The mailbox wasn't outside the home, but when you open the home, its there in front of the door.
What do I mean by a nothing small home 🙂 nothing really just a term I made up on the fly.
The home doesn't have windows, its small, it has no furniture, no paint, its a nothing small home 😃
You asked: Does it happen on every lot.
It has happened on 3 different lots, in at least 2 different worlds: Windenburg and NewCrest.
4 lots adding the recreated problem.