Better look at the shaft! (Bottom)
The pushrod will oil the pushrod cup, the hole in the pushrod cup oils the rocker to shaft interface. Without the hole, the only oil to the shaft area will be splash from the adjacent rockers, that may or may not be enough depending upon how hard the car was run. Also look at the valve tip, oil in the rocker also spills off of the end of the "bathtub" onto the valve tip, or again, splash may have saved it.
Good time to order 1.65 hi lift rockers! They come with new shafts and spacers, and you can return those buttons too.
TIMINATOR