We've had staff members going back through the info from our security cameras, but we don't have 100% coverage (and they're low-grade quality to boot), but so far they've not spotted anything useful. *shakes head*
Yeah, F. (the children's librarian) has just about had it. Someone told her to forget about it until she came back and she said, "If I come back." I know that that's just the frustration speaking, but I can understand the sentiment.