Sorry to hear of your birds adventure, your bird has a good few things that can help it, he is young and fit, being a grey will not travel far, predators are always a problem like dogs, cats, raptors and crows its not easy to find the bird on farm land i know i have tried to find greys my self and so much will rely on how your bird will react to situations it comes across. even if it is spotted trying to reach it (9as it may be high in a tree) will be hard to get it to come down and so much will depend on how well he trust people. saying that the three greys i have helped with searches on only one was found and returned to its owner after being free for two and a half weeks, one was spotted but flew and disappeared in local woods and never spotted again the last one no positive sighting at all. ok your bird will need to find food and water so try to look in trees near a small river or stream, this hot weather will make him/her rest more and being they are more prone to call out first thing in the morning or last thing before dark you are doing correct by going out at them times. a scared bird will remain quiet. when looking in trees greys normally settle around the middle of a large tree not near the top as they are more exposed. using the pidgin loft shows me your bird has brains . it may of found water near by and grain, this may mean he will take longer before he needs human help. a clever bird is a survivor so do not give up hope