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