Wildlife Spotting

I keep finding this creature in my bedroom for the last one week. Each dayI could spot one until three of this creature. It looks like caterpillar or maggot.

My first suspicionis I think this is kind of maggot. Above my room is a warehouse. So I suspected, there's dead mouse, and there were maggot around the mouse, and it fell down to my room.

The next day, I asked someone to check upstair. He found a dead mouse. He've cleaned the already dried carcass and the mess, also sprayed Baygon to the area. On that day, I still spot that black creature, but at that moment plus white maggot, a kind of maggot that I usually know.

The next day, i still found this black creature. Then my mom swept the warehouse again.

The next day, this black creature still popped in my room. My dad said perhaps it's from the tree in front of my bedroom. Yes, in front of my bedroom is the garden.

And today, we still spot this black creature in my room. My parents are starting to speculate in mystical way, that the creatures are sent by someone who may not like me.

Okay, i dont wanna trap in my parents delusional thinking. I think I can find out where this black thing comes from by first identifying the species of it belongs.

I dint know whether it's appropriate to ask this matter here, but I'd really appreciate the help. Thanks in advance.