That’s a QFN16, isn’t it? The only NFC chip that I could find on Mouser with that package is the NXP NCF3310AHN. There’s also a die sized chip on there.
Also, what did TagReader say about the chip?
Can I ask for the dimensions of that glass vial transponder? It looks rather large. And by the looks of how the glass was sealed, I’ve got the impression that it’s not even close to DT’s quality.