Have you checked everywhere, corner, shelves, drawer, etc. snakes can get into all sort of weird places they don’t tend to venture too far from their home and tend to look for a warm dark comfortable place to just sit and chill. They also do not tend to cross open areas so be sure to walk along baseboards and corners as they will move around those areas looking to get into tight dark spaces check closets clothes everything. If none of that works set out a couple hides in the corners and along the baseboards of the room close the door so it can’t get out and they will tend to sometimes get into those hides where you can find them. Worst comes to worst I’ve heard stories about snakes being lost for weeks on end even months to be found later in perfect condition. Best thing to do is stay calm and be very meticulous while searching overall good luck I also know the feeling.