>On occasion I'd picked up keyboard, invert it (so it is key side down) then shake vigorously while tilting in various directions. Depending on various factors (notably the habits of the user), you'll get varying amount of debris -- on a few occasions a surprising amount of debris came out. On a few occasions I'd seen stuff like paper clips fall out.
>
>One annoying thing with keyboards nowadays is that the printing on the keytops is only on the surface, so they tend to rub off in about a month or less.

Which at least doubles the value of the keyboard. I've seen a pro keyboard with NO LABELS on the keys, and the price was outrageous.