Start where an escaped shrimp most likely is
Search for an escaped cherry shrimp close to the tank first, because most escapes end within a short crawl of the water. A cherry shrimp usually leaves by climbing a filter cable, an airline, or the silicone in a tank corner, so check the dry glass above the waterline, the underside of the lid, and the outside of the tank at those climb points before you search the room. Look inside the filter housing and media as well, since a supposedly escaped shrimp is often alive inside the filter, not on the floor at all. Work with a torch held low, move slowly, and watch where you kneel and place containers, because the shrimp you are looking for may be on the floor beside the stand.
How to search the room in the first hour
Search the room for a cherry shrimp in widening, careful circles during the first hour, and keep the area undisturbed. A shrimp out of water dries quickly, so it tends to stop in damp, shaded places: under the stand, along skirting where condensation collects, inside a discarded water-change towel, or in the bucket used that day. Check buckets, nets, and plant trimmings from any maintenance before you empty anything, and do not mop, sweep, or vacuum the room until the search is finished, since any of those can kill a hidden shrimp. Shut cats and dogs out, ask other people to stay out or join the search on hands and knees, and check shoes and socks before anyone walks across the room.
If you find the shrimp alive
Return a cherry shrimp found alive to its tank gently and without a long inspection. Wet your hands with tank water, pick the shrimp up softly or coax it onto a wet, soft net, and lower it into the tank, ideally near plants where it can hide at once. If it is coated in dust, let the tank water rinse it as it settles rather than rubbing it clean. Watch for movement of its legs and swimmerets, normal grazing behaviour over the next hour, and any whitening of the body. A shrimp that resumes feeding and moults normally in the following days has usually recovered; one that stays motionless, turns opaque white, or is found dry and curled was likely out too long, and the rest of the colony still needs the escape route fixed.
Closing the route and counting the colony
Close the escape route after a cherry shrimp incident, even if the shrimp was found safe inside the filter. Fit a tighter lid, cover gaps around cables with a sponge or mesh the shrimp cannot pass, lower climbing lines away from the rim, and count the colony at the next feeding to confirm whether one shrimp is still unaccounted for. Note when the escape was noticed, where the shrimp was found, and what changed, because a second escape almost always uses the same route. Also check inside shoes, folded towels, and the water-change bucket left near the tank before any of them is moved or washed, because a cherry shrimp carried out of the tank on a net or plant often drops into exactly those soft, damp hiding places. Shaking laundry over the bath before washing protects a shrimp that no floor search found. Fast, organised help matters in that short window, and KinsLe supports it through Lost Pet Alert System, which sends a free alert so the people nearby get the shrimp's photo and the search area without delay.