C4 Transmissions built between '64 to '69 had a ball & spring for the manual valve detent built into the valve body. After '69 the design of the valve body & also the manual valve was changed. The '70 & up manual valve is a spool valve design & uses the lever in your second photo with the "rooster comb" design. The detent is a spring loaded roller bolted to the case with the roller acting on the rooster comb.
Here is a picture.
Your photo shows the valve body with the filter removed. The valves are encased in the top half of the valve body & are not visible unless the VB is removed.
You have however a valve body from '70 up distinguishable from the hole on the left hand side under the filter for a spring & poppet valve. This is the torque converter drain back valve & will drop out when the filter is removed. The drain back valve has a different location in VBs from '64 - '69.
The 2 photos below show the change in manual valve design after '69.
The first photo shows the early manual valve with the detent reliefs machined into the valve.
The 2nd photo shows the spool type manual valve used on '70 & up transmissions which is why an external roller detent together with the rooster come style shifter segment was used.
Hope it helps. Cheers. Gaz
Though it functions as a valve the actual hardware is a small spring and a ball rather larger than a BB. Back you could ask folks on the internet what those objects were that sprang out of nowhere when you removed the filter a lot of them got thrown away because people quite frankly either couldn't figure where they came from or they sprang out of sight somewhere.no valve fell out when I removed the filter...