JR8, it's not moldy that I can see. What you are looking at is the design on the boxspring cover. Looks like it's ivory & beign/gold design as it's a consistent pattern. I've never seen mold be consistent.
But I have to wonder as to his intentions, especially seeing neither his nick nor his email turns up anything in Google. Throwaway addy but with a local ISP. He hasn't run up enough posts to reply to PM's and hasn't posted a flurry of useless posts, so he may well be legitimate.
Having said that, Jimm, if you are coming from a western country (or at least the US anyway), and you are bringing your own linen, beware that king sized beds in Asia are shorter that those at home by around 6 inches. So if you are 6'4" tall you might be in for a rude awakening.
SOME PEOPLE TRY TO TURN BACK THEIR ODOMETERS. NOT ME. I WANT PEOPLE TO KNOW WHY I LOOK THIS WAY. I'VE TRAVELED A LONG WAY, AND SOME OF THE ROADS WEREN'T PAVED. ~ Will Rogers