Hi, we lost our black cat on 17-01-16 and after much searching, leafleting all the houses & putting up posters, we found him last night! My husband went out at 11pm when it was quiet & banged a food tin ,calling the cats name & eventually Spider came running. He was lost quite away from home, very scared & hungry. Thought this might help you look for Cosmo. Try to leaflet as many houses & talk to as many people as you can ( it was hard work but the kids enjoyed knocking on doors asking for their help).Don't just do the closest houses, because chances are he's wandered farther than you think. I really hope you find him safe & well.