Posted: 01/07/2014 at 15:11
The seeds in opened foil packets will start to deteriorate as soon as they are opened, even if you fold the packets carefully.
Some seeds will not keep from year to year anyway.
Some seeds are viable for years and years. Eg tomatoes and lettuce to give just two.
I don't think your choice of container made any difference; but the temperature will. Keep seeds cool, in the fridge if possible.
Some of the most well-known companies have the poorest germination rates in my experience. Beware of catalogues with highly-coloured pictures!