He wasn't asking for a test or proof of concept from Bucky in the moment, just something to keep an eye on in future: but when he speaks, and it's just 'in the car' and nothing else...

It takes all his self-control not to just get up and out of the fucking car and walk home. He's so fucking tired.

"After everything I've just explained, what makes you think I even know what my own fucking car looks like?" It's practically through gritted teeth, but he just sighs and flops harder into his seat, turning his face towards the window to hide his irate expression, even as his voice goes decidedly flat. "I-it doesn't matter. It's fine. We still found out something more about this place, we have items we can follow up on with the others to learn more later."