The adage that you only have about a 50% chance of getting a lost snake is not true - but it depends greatly upon your circumstances how likely you are to get your gem back.
Hard, fast rules:
1. No cats or dogs indoors anywhere near where it may be.
2. Close all doors & windows QUICKLY when you use them.
3. Check corner areas of closets, and inside cabinets.
Which season makes a difference. We are heading into warmer weather; more incentive for the snake to exit and be outside. Frequently check obvious basking areas near the home if you suspect it may have gotten out.
It is MOST likely:
1. Hidden & safe inside a heat grill on a wall.
2. Hidden & safe inside a closet.
3. Hidden & safe inside a stored box or unused room.
If it has gotten outside, with warm weather, and abundant cover, it's best to prepare yourself for a loss...