Cause for anxiety

One of our three cats is missing. Buddy, aka Budzo, aka Spud, aka Spudringo, aka Buddy Von Beastingham, a brown tabby with a pointed snout and impressive stripes, got out into our enclosed backyard two days ago, went over the fence into a neighboring yard, and has not been seen (at least by us) since. He is a very active one year old "fixed" male who doesn't sleep much by species standards and has one of the great cat swaggers, as if to say "I'm not looking for trouble, but if it finds me that's okay." Very sweet-tempered and affectionate (he is a face-licker), although I wouldn't want to be the mouse that met him.
We're hoping that he's okay, and also that he will come back. Even cats that purr loudly while shoving their heads against their owners' hands are not always averse to accepting better offers, defined presumably in terms of food. Perhaps Scott Boras is advising him. Then there is the possibility of house arrest, although we have been spreading posters in the hope that he will be recognized and returned. Other possibilities are best not thought about.
I gather cats sometimes come back weeks or even months later. But tough times in the interim, for adults as well as kids.
UPDATE: He's back, after an evidently excellent 5-day adventure that culminated with his meowing loudly to us from a neighbor's balcony several houses away. The balcony seemed impossible to enter or exit other than through the house, where no one was home. He agreed that it was impossible to exit, and is not telling how he got there, but with help from inside the house he is back.
After eating and drinking for perhaps the first time in days, he's asking us to let him out again.
This is related, I think, to why Social Security should offer a fixed real life annuity without portfolio choice.