I just had this happen to me maybe a month or so ago. I had a hatchling pastel that was only 57 grams and only had one meal get loose. I thought she was a goner, everyone told me I'll find her and not to worry. I was hesitant to believe them. (sorry)
I tore the entire reptile room apart and looked all over the house. I set up FOUR traps with live and frozen rats in them. Nothing.
4 days later she popped up and weighed in at 48 grams.
They will be found when they feel like it! LOL. Don't lose hope... Just keep an eye open during the night.. They seem to be found when you're not really looking for them.