I never did get Kyler to tell me where the lock and key were for the TV. We did manage to clean up their room this past week, and I've been on them daily to put their things away instead of throwing them on the floor, and to celebrate we watched my favorite kid cartoon, The Hobbit, over the course of a couple of days.
So on about Wednesday I happened to be looking through a drawer in my sewing desk, and low and behold, there were the missing locks and key! Kyler rummages through that drawer daily, although I never would have thought to look there. I immediately replaced a lock in the TV plug, much to the chagrin of Kyler, who then ran to my desk to have a look for himself. I won't be leaving the extra lock/key around any more!