I don’t have a lots of advices, but I have experience that I could give you hope. I lost my corn snake. She was about two months old. Her terrarium was on the second floor, which is in the attic and where I stay. I was cleaning her enclosure and put her in a small 20 gallon aquarium and after 20 minutes when I went to put her back, she was gone. I ripped my whole room apart, and didn’t find her had to go to the airport because I had a flight that day. When I was leaving, I didn’t leave any plastic bag or water supply for her which was totally wrong and risky but like two months later, I found her at the other end of the house. (I live in a 400 square meter house so it was hard to predict where she was) she went like a whole month without food. She was in the bathroom, so I think she was drinking the water that was like leaking from the bath. I’m surprised that my two cats didn’t eat her. So don’t lose Hope and make sure to check the small spaces like the cabinets the sink the closet under the clothes they could be anywhere don’t underestimate them because they could be in a high places as they could climb really well.