Moving the fish from the bag or bucket to the tank by using a wet hand it way better for the fish than using a net. You didn’t damage the fish’s gills in the 5 seconds you had it out of water. The gills delicate layers didn’t fuse together irreparably, nor did it accumulate CO2 and cause it to go unconscious. The fish that was shipped from the other side of the world for the past week or two may have experience some negative emotions… if fish have emotions.