As mentioned, don't give up hope yet. My girl was out for two weeks once, I tore the computer room apart pretty much once a day, often with help from my sister or husband, or both. Going from one side of the room following the wall till we where back at the door. She is nearly at the 2000 gram mark so not a little snake. I checked the computer room multiple times a day and after work my husband practically lives in the room and we never saw her. Then one day a little over two weeks later I popped my head in just to look before going to bed and there she was! Sitting right at the corner of my desk, to this day I still have no clue where she hung out for all that time? So you never know, check the room his cage is in often and you might just catch him sneaking around a corner one night when you least expect it.