I'm pretty sure the SE/30 came with the original ADB Keyboard included, as LCGuy said. Many users chose to buy the "extended" keyboard so they had a separate numeric keypad etc. I recall the local University putting a heap of unused standard keyboards out to tender because their users had opted to buy extended keyboards for their SE/30s.

I always used a IIGS keyboard for testing Macs on the workbench. This was for a number of reasons: 1. it had a small footprint - didn't take up make space. 2. The sales guys weren't ever tempted to "borrow" it to get a client out of a tight spot! 3. I kind of liked it.