Come Home Little Kitties

My little babies, Vader && Cora, had to go to a temporary new home while I moved back home with my parents for the rest of my pregnancy & a few months after so I will have some help with the baby.
One of my clients (whom I LOVE), Christina, took them as outdoor cats (when they have never been outdoors ever) because I didnt want anyone to have to take on two cats as indoor cats when they are doing me a favor. I felt like it would be too much. I had been wanting to make them indoor/outdoor cats for a while, so I felt like this would be a good time to do it.
I did research on how to make them outdoor cats and asked my friends how they did it. We kept them in a crate outside of Christina's house for two days and when we let them out fed them their favorite food && let them do their thing. So that way they knew that was their home && thats where food was coming from.
That was last Saturday, a week and a few days ago. The first day outdoors was fine, they didnt go far at all from her house. Then I got a text saying Vader was in a tree and had been there for hours just meowing and crying. I went over there to see if I could do anything and of course I could do nothing. You better believe if I wasn't pregnant I would have climbed that tree & got him out. Cora stayed close to the house still and had no interest in exploring.
Christina went to bed && Vader was still in the tree. When she woke up he was out of the tree && Cora and him were gone. That was Wednesday & it is now Monday night and there is still no sign of my babies. :( I went over to their house this weekend a few times while she was at the beach with her family and there was food missing. It made me super excited because Christina said there aren't other cats around her house so I thought they had come back, ate & gone back out to explore. But then when Christina came home she heard a meow outside, went and looked and it wasn't either of mine...which means that is probably who ate the food.
A lot of people have been telling me how their cats ran away for a week or a month and came back like nothing happened. Which I HOPE they come back. I dont know if they are safe, or together, or hurt, or just loving the outdoors. I know nothing which is what is killing me.
Christina is sending out a mass email to the neighborhood tomorrow seeing if anyone has seen them or anything. It was HARD for me to give them up & I knew I had to prepare myself for anything that could happen but it really sucks. Those kitties are my life. I cant imagine never seeing them again. Come home little kitties, I miss you pretties too much :(