Yes, my apologies. I did not realize there was a standardized format here.
Yes, there are plenty of zombie corpses around. None of them seemed to move/disappear. No, I did not fight any zombies in my base for several days. My base is the construction site in Rosewood (Reference: https://map.projectzomboid.com/#8254x11876x1027). As you can see from the base's layout, there is only one way in or out of the base for zombies, with that being the gate on the south side of the wall. The gate was intact, as was the door on my base, which is the north-most trailer. I barricaded every window and put sheets over every door and every window and door is intact. I reloaded the game in front of my TV and the zombie appeared in front of the bathroom door, only a few tiles away.
The trailer that set off a house alarm when I re-entered it is the trailer directly adjacent to my trailer to the south-east. There were no zombies inside, but I had previously entered and looted that trailer multiple times without issue. The house alarm aggravated a zombie in the bathroom of the trailer to the southwest of the trailer that set off the house alarm, which was also previously cleared.
The closest house on the west side of the construction site was also previously cleared and again set off a house alarm when I entered it to see if zombies respawned there, too. There were no zombies in that building, but the house alarm did go off when I entered through the unlocked front door.
Please let me know if I can provide any further information! To reiterate, I am playing unmodded on survivor mode in the unstable build. I believe these events occurred on the 41.72 build, but I have since moved my save to build 41.73.