The containers btw are aluminum and you're using 316 stainless (please do use 316, it's better for corrosion properties). Different metals, different electric potentials.

If you're extra corrosion cautious you might wrap your seed phrase assembly in a ziploc (if you can fit it, it'll be a squeeze) before putting it into the pill container to mitigate possibility of galvanic corrosion risks through insulation.