There is a smirk that accompanies Tony's response. Guilty as charged. There really shouldn't be a surprise. "Probably not," he admits.

"Thought I would check the place out. See if I can find anything useful." By which he means, things he can turn into weapons that blow people up. It's a forte of his. Might as well use what you've got. He doesn't mind divulging this information to Donatello. It's not exactly something that the turtle-guy doesn't already know, anyway. Plus, he's mildly curious as to what he's doing here, also.