Please Help! Missing Cat

All, please help me. I am desperate. My cat has gone missing. He snuck out yesterday at 1pm while my partner had the front door open. I am out of town currently, and was when this happened, and I am just devastated. I've had him since he was a kitten. And I don't know what to do without him. His name is Queso, he is an orange tabby cat. Warning: He was abused before I got him, he is very distrustful of people. He will run or become verbally hostile when cornered. He responds well to food and those temptations hard treats. We live downtown Austin near UT, around the St Davids on 32nd St area. Please reach out if you have him, see him, or have any leads on him. He is microchipped. Does not wear a collar because he rips it off. I have reported him lost both to Petco lost/found and to his microchip registration, that 24PetWatch thing. Please help me. I am worried sick. UPDATE (4/22): Queso is back! I have to get the full story from my partner as I was asleep at the time. But he texted me saying he has good news. So I went back on the security camera and see him letting in Queso at 3am. From what I can tell, he just walked in like nothing happened and without a care in the world like "oh you were looking for me?". The camera cut off after since it's only activated when the door is open. But yay he's back! Thank you all for your help, support, and kind words!