If it's not been too long since it happened it's worth trying this.
Shine a light across the floor with an eye as close to the floor & light source as possible and it should be easily spotted. I've had to do this many times when I've dropped a <2mm screw.
Over the years I've also found the missing screw in my workbench cupboard, draws, my boot/sock and pocket, it's amazing how far they bounce.
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