I had one once escape his cage and get into the wall via a small hole under the bathroom cabinet. I put out his food and sat by the hole for hours waiting for him to come out. Once it got dark out he came for the food and I trapped him
Definately lure him with food, he is going to get hungry and come out to search.
BTW if you want a really great rodent for a pet, get a rat. I had several as a kid and they were very easy to train. Mine did tricks and I could even let them loose in my room! They were paper trained and they came out from where ever they were when you called them! Truly wonderful and sweet creatures. Every hamster I ever had bit the crap out of me when you tried to pick them up. Rats, never ever bit!
I even took one trick or treating with me! He stayed on my shoulder for several hours!
Good luck finding your little friend though
I believe I can fly.....