Hi
Don't give up on trying to find your missing little guy, they can really surprize you and all of a sudden show up one day.
I had a gecko escape from me once and time passed and months went buy and I would always keep an eye out for her, until it had been so long that I was just starting to give up hope, well 8 months later I found her one day with her head sticking out from under one of the gecko tanks, she was skinny and I had to nurse her back to health. I got the weight back on her and I still have her and she is doing just great.
I will tell you something cute that was posted a few years ago. A mother had posted for her grade school aged child and said that he had lost his gecko and that it was missing for like two weeks and then one day when she was in her younger sons room she looked over at this pile of stuffed animals her son had on the floor and had to do a double take, because there in the middle of these stuffed animals was here older sons missing gecko.
So, don't ever give up, big surprizes do happen when you least expect them.
Take Care, TLB