Blue-yellow budgie with white face, missing

I'm really worried about my blue-yellow budgie. Yesterday around 3pm, he slipped out of his cage when I opened the window by the library on Hardy Street near the USM campus in Hattiesburg. He's tiny, about the size of a soda can, with a bright blue body, yellow belly, and a white face. There's a small red leg band with the number 42 on his right leg, and you can spot a small white patch on his left wing when he preens. He's usually super friendly and chatty, and he loves millet spray; he's been part of my life for years, so this is really stressing me out. If anyone spots him, please message me through the site — I’d be forever grateful to get him back.