I wouldn’t take the blower back off to check them or anything, I doubt they would get sealed off air tight and build pressure inside the gear end, their just something to be aware of and leave open. If it was to be 100% sealed off the pressure would then have no where to go except past the seals and carry oil into the supercharger and mix it with the aircharge. It would be such a small amount you would never know it’s happening but after a few 1000 miles of it depending on the temperature swings the blower sees in operation the oil level would get lower and lower, there’s only about 8 oz’s in there to start with. Don’t loose sleep over it. As far as octane boosters go, if your adding enough to change the octane your adding enough to build up over time, me I just won’t use it any more, but being able to run corn now that’s a no brainer in not having to use it for me at least but I know corn isn’t available everywhere.