One's an accident, two's deliberate?

Had 2 washcloths disappear after the last guests checked out. I can see one being taken by accident but two?  And yet I have a hard time believing a nice couple would deliberately steal 2 washcloths (albeit, nice cotton/bamboo blend ones.) And, yes, I do remember putting them out.  I've checked in drawers and under furniture.  Even checked the linen cupboard to make sure I put them out. Yup.  Gone.

Now the 2 towels are missing their matching cloths. So, what do I do.  Eat the cost?