I gave up on strike-anywhere matches a long, long time ago. Never could get any that were reliable after any time in storage, even carefully sealed. The white tip would rub off and that was it. In fact, the way I would guarantee that the matches would work was to pack a safety match striker strip (folded over onto itself) with the strike anywhere matches.

I actually had better luck with good ol' paper matches. They would work even after being soaked and dried out. Just tear out about four of them including the base they are held by and you have yourself a surprisingly decent match.

Bics replaced them and I've never looked back. I still carry lifeboat matches for extreme situations, and they do seem to hold up over time.