Received a hobby box in today for 22 A&G. I am a long way off from having a complete Base set (no variations)

See my signature for needs. All cards available are also listed there as well.

side question. I received a mini of Lou Gehrig with NO NUMBER. from what I can see online, it says this has (50 copies). Does that mean there were only 50 made??? if so, why not include a serial number? Why leave that little detail off?? anyone know?