So I sent a note to my contact at Chicago Apartment Finders and to My Former Property Manager just framing it as "hey I sold my condo so I don't care what you do but if that lock box costs what I think it does, you might want to come fetch it before the CA cuts it off the fence." I of course used nicer language and emoticons.
My Former Property Manager, upon hearing the news that I sold the condo, congratulated me and said he would take care of the lockbox. No acknowledgement that I managed to sell 1) without his special brand of help and 2) at a higher price than he believed I could achieve (I'm confident he looked it up as he knew my property had been listed and at what price).
Note: I wanted to post this Dilbert Cartoon which aptly describes Former Property Manager business model. Alas there is no way to download it and the image-by-url feature is blocked for copyright purposes.
I should point out that I am very lucky he was so recalcitrant in his stance in using an Exclusive Rental Agreement contract. Had he offered an Non-Exclusive Agreement like Chicago Apartment Finders I probably would have just let him find me a new tenant and I'd still be a Reluctant Landlord right now.
Former Property Manager said that the new owner would likely change the locks. Well I certainly didn't. I certainly intended to but that task slipped away from me, both in terms of cost and time. And I suppose I was hedging my bets that since the former owners bought in Saganash they really didn't need anything from my bachelor pad.