Socks don't go missing from the dryer -- the washer is the culprit. Really! Did you ever check the sock match-ups between wash and dry? (no).
So, go have a look at the washer. Up under the agitator you'll find all the missing socks.
This is also the main reason older washers lack "zest" in the spin cycle - all clogged with socks.
Some threads however, are too thin to go missing in the either the washer or the dryer. Must have just got washed down the drain.
Suze - heading for the bbq, beer in hand in Portland, OR