Ok so apparently:
When an old neighbor moved they left him (dunno if like accidental or abandoned so can’t say anything about them) in this little strip of our apartment
The lady that called us said yes, he was her brothers cat
He kept getting out for like 4 days in a row?
Our landlord found him and we have her the ladies number, lady said no it’s not our cat it’s just a stray we feed because her brother got attached to him but he is NOT their cat, just a stray
So
Now we have a new cat
Either that or we might ask our old roommates since they have a few cats already and we know all those cats get along living with other cats so introducing them will be easier