Hey Brittany, sorry for the loss. I have lost a baby boa once, I looked everywhere for her and I could not find her, I figured she had escaped for good. Well 2 months later there she was sitting on top of my pet collosal rats cage. She was drooling away and hungry. I tore apart my home and the only place I think she was hiding was in the top cabinets in my kitchen.
I have had a friend lose a kingsnake only to find it in an old VCR under her bed. I have heard that is a common place snakes love to hide.
Keep looking, you may just find Snape sleeping under your mattress.