Those keyboards would be Quadra era keyboards.  They stopped making those in 1995, and the PowerMac 9600 came out in 1997 and shipped with the squishy key extended keyboard.

However, they're only 2-years apart.  It wouldn't be out of place to see a PowerMac 9600 with a much nicer ADKII, especially if the person didn't want to buy a new Avid key cap set or keyboard.