Found: 17 pairs of socks, not all match.

Roger and Catherine Dellor’s cats – Cleo and Tony – have been bringing them presents: someone else’s socks.

“At first, it was just one or two,” said Roger Dellor. “Now, they are arriving every day.”

The Los Altos couple thought they could return the socks to the proper laundry basket after making a plea in fliers they put in neighbors’ mailboxes.

“Neighbor, are you losing socks?” the flier asked.

No one has stepped forward so far, but the Dellors think they know where at least some of the socks are coming from.

One of their neighbors, for reasons unknown, has a bag of socks in his driveway of the cul-de-sac neighborhood where the Dellors say it is safe to let their cats out.

“I saw a bag of underwear, too,” Roger Dellor said. “I just hope the cats don’t decide to bring home the underwear.”

The neighbor, reached by phone, declined to comment.

Cleo and Tony aren’t the first cat bandits in the Silicon Valley.

A few years ago, Julie Soule’s cat, Oscar, became known as the Los Gatos Cat Burglar.

Oscar had an impressive cache: tennis balls, an entire roll of toilet paper, a Nerf football and a satin pillowcase.

Soule tracked down some of the owners, and neighbors soon learned where to look when items went missing from their porches or patios.

The pile of socks may not be as interesting as the Los Gatos take, but the selection is intriguing.

There’s basic white athletic socks with gray re-enforced toes and heels, and there’s brown socks and navy socks, like the ones men wear to work. Some of them are stained because the cats apparently dragged them through the grass.

“I saw Cleo the other morning with one in her mouth,” Catherine Dellor said. “She was growling like it was a mouse.”

Missing a sock? E-mail the couple at cleo@dellor.com.

Contact Linda Goldston at lgoldston@mercurynews.com or (408) 920-5862.