The assumption of it being a snubber is due to page 7 of that datasheet which mentioned it being a snubber. Obviously I'm uncertain and open to accepting it being used differently.
I fully agree with you on the voltage. I planned to buy the largest voltage rated capacitor I could; unless of course it became so big that it wouldn't fit under the RF shield.
I already supplied the measurements, but tonight I measured the height to be approximately: 0.065" or 1.65mm
Attached is the measurements using different meters. To make sure I got good connections, I soldered fly leads to the capacitor even after I measured it without the leads and got approximately 24nF.
The first meter I used (not shown) was a Fluke 179, and this is where I got 24nF. Initially I used the test leads connected to clip leads, thus making the leads far too long. Unfortunately this was the only way to make a solid connection, but eventually I used just the clip leads and held them inside the meter test lead holes (although I didn't see much difference in capacitance using shorter leads).
After I used another meter, and, to make sure meter lead length wasn't an issue, I held the capacitor directly to copper wire I shoved in the holes due to them not accepting the larger size plugs on my test leads. The clip lead holding the fly lead on the capacitor isn't connected to anything and just used to prevent my body from altering the capacitance measurement by holding it directly.
You'll see in all cases the capacitor measures approximately 23nF, however, I'm still open to the possibility this capacitor should be a higher value.
The replacement capacitor someone shoved in another channel/circuit is a typical 0603 (?), so I assume it's not the correct voltage. Since I didn't see any capacitors in the other channel with poor soldering, I'm confident someone didn't take time to remove a good capacitor and measure it like I did. My point is: it's probably good I'm taking time to replace the small 0603 capacitor.
On a side note, I sent an email to Panasonic about whether a spec exists for that capacitor value in hopes this is a external value called out for their part. So far I got the request on providing my company name, predicted volume, whether it's a new project, etc... After stating that I'm just a hobbyist requesting technical information, it was asked I provide expected voltage, load current, etc...
Since I don't know any of these numbers, I guess I'm out of luck in taking that route.