be sure that they've not just come off ice when you do the tap test. they're very sluggish when cold, so they may not seem to close as quickly as you'd expect, so you'd end up tossing perfectly good ones.
the better test is if they don't open up when cooked. definitely chuck any that refuse to open, or only open slightly.
The way that you wander is the way that you choose. The day that you tarry is the day that you lose.
Sunshine or thunder, a man will always wonder where the fair wind blows.