>>>Is there any way you can get the message out on your local "grapevine", that someone "borrowed" your bikes and you'd like them back? Not blaming any of the neighbours, of course, but just asking them to keep their eyes open ...
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>>I usually exchange a line or two with my nearest neighbors, as they are the only ones who are regularly spending time outside in the back alley, when I return from my ride. Oh.
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>Another thought - sometimes with bikes, kids just take them for a joyride. They know they can't bring them back, and they can't take them home 'cuz their folks'll slap them upside the head. So, they dump them somewhere.
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>The grapevine might be able to tell you where the local dumping ground is ...

In that case, the nearby construction site (half a mile of a major street getting two extra lanes, which means widening two bridges over local creeks) has dozens of such corners. I remember seeing a few of them while I was riding my kilos off. Completely inaccessible by car.