Sister in law lost controller and returned it after a year, checked batteries and they were fully rusted and this is how the inside looks; is it safe to use?

Slight rant throughout the rationalization btw. Not fairly sister in regulation, the sister of my associate whom I plan to marry sometime. I lived with their household till lately. For context her room is disgusting which is how I think about this occurred. She swore she left it in the lounge, time and again, however it was by no means there. She unoficially left about 10 months in the past and formally moved 5 months in the past, I let her borrow the controller a 12 months in the past. Her room was so disgusting and filthy we prevented it (canine always pissed in there and was not taken care of so it was unsafe). This final week she was again on the town and located it in her room and used the excuse "somebody should have seen it in the lounge and put it again in my room" (everybody knew the black controller was mine and hers was the white, although). So I'm not shocked it received ruined however am indignant. Any probability that is nonetheless secure to make use of or no?