Count my 10 as lost! To be fair they were worth a few bucks at most when I lost them.
I personally saw someone accidentally wipe 150 or so when they were around $10.
It was fairly big news in the UK when somebody announced he had thrown away a hard-drive containing 10,000 coins. He considered searching through the dump but didn't bother in the end.
That's about $40,000,000.- I would do more repulsive things than diving into a dumpster for that kind of money.
It wasn't just a trash can, it was an actual garbage dump site he'd have to search through. Chances of finding something there are slim I'd say. IIRC there was a photo with the article of the guy standing at a dump site - not sure if he didn't actually go look for it a bit and gave up when the reality of the situation hit him.
It just adds more appeal to the deflationary flavour of Bitcoin.
I lost two a long time ago. Broken harddrive and as they were only worth less than E20 at the time, I put off retrieving them. Moved house and lost the drive :(