I may have found a clue...
Tonight I came across a pair of glasses I do not recognize. They look to me like prescription 'specs...however, I will admit that I am no expert on these things myself. Nobody that I can think of that I know wears glasses like these (very, very narrow and rather feminine in style) so I think they may have something to do with the theft I suffered earlier this year.
Tomorrow, I'll take them down to the cop-shop. Maybe they can figure out whose they are one way or another---and if they can't/don't have the manpower, I'm perfectly willing to go talk to optometrists myself and see if they are prescription glasses (as opposed to reading glasses that you buy OTC) and, if they are prescription, if they can be traced to their owner. If I can find out who owns these, I may well have a big fat clue to the identity of the thief or thieves.
Being a true-crime buff, I am reminded of what became the downfall of Loeb and Leopold, the wanna-be master criminals who tried to commit the "perfect crime" in 1920s Chicago: Leopold had a pair of glasses that he seldom wore fall out of his jacket pocket as he and Loeb disposed of the body of their victim, Bobby Franks, in a culvert. The police found them and traced them to him, and when his story about where he'd been and what he'd been doing on that day didn't add up, things started falling apart for the would-be Nietzschean Supermen right quick.