Welcome to CCF. The series 1996 $100 New York district went all the way up to the AB-Y block, so AB-X was not the end of the line. The 1996 $100 New York district star notes ended at serial number AB19200000*. I'm not sure what you mean by one-of-a-kind since serial numbers are not duplicated, all of them are. Condition is everything, please post a photo when you can.
If it was uncirculated, I'd be tempted to keep it. It was printed in July 1999 and appears to have a center fold and handling marks. If you like it, keep it, but to me, it's a spender.
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