Did he just? Kell doesn't lift an eyebrow, because one, he's not really that expressive, and two, it's not his style anyway. Back home, he wouldn't have been even mildly interested in what exactly connects Lucifer to this poor kid. He'd met them both by chance, so why would he. It's not as if they're related.

Here, it's different. From the very beginning, it was pretty obvious that things happen to all of them because they are Summoned. That warrants interest. If only for the sole purpose of keeping himself and his brother safe.

"He lit it on fire, that's what happened to it."

What he does not volunteer is the information that while yes, the card was damaged, but his own attempts at restoration were woefully unsuccessful. Didn't Lucifer just explicitly reprimanded him for sharing information?

"I don't know. He took it and left. I assumed he did it with what the message said we should. Placed in concealed spot. Like I did with mine."