Just a question, have you tried walking up and asking these people if they want to rehome the turtles? Because if you just take them and they catch you, you're the one who will get in trouble. Animal control already knows you called about them and they do cooperate with the police if these people get angry enough to file a report. There's always the catch that they might tell you no or ask some ridiculous price for them. The big turtle is huge and would be worth some proper money if actually well cared for. But you can't just take the turtles or it will likely be you who gets in trouble. It certainly doesn't look like there's any way to make it look like the turtles climbed out on their own...not much to sit on in that tank from what I can see.