All matches break down over time, that is half of why I shellac my strike anywheres. These are already coated, but if you want to be really sure, find a very long match case, and put an O2 and dessicant package in with them (easier than a sliver of dry ice), and grease the cap with something like a lithium grease. Then vacuum seal the whole thing.

Problem is that the striker itself has a half life, and as I recall that is based on just the decay of the compounds. It would break down in deep space, stored in the thin stuff.