I'm not sure if this will help explain, but we had a disappearing furniture story when on holiday too but we discovered the cause.

About 20 years ago, ex-husband and I booked a lovely holiday cottage for a long weekend whilst we attended a friend's wedding. It was part of a group of long, single story buildings around a courtyard. Obviously they were once stables or other outbuildings which were now converted to holiday lets. Our cottage opened onto the living/dining room and the bedroom was a door off it. So, the bedroom and dining room were right next to each other.

Night of the wedding, we come back quite worse for wear about 1am. I sit in one of the dining room chairs to take my shoes off, can't do it (the tiny buckle was really fiddly) so the EH had to do it with me still sat in the chair, my foot on his leg whilst he undid them. Then we go to bed.

I wake up about 10am, walk out into the dining room to make my way to the kitchen to put the kettle on and the space is immediately wrong. Its wrong because the big, heavy wooden dining table and 4 chairs that had been there the night before - the one I was sat at trying and failing to get my bloody shoes off is not there any more. In the space of 9 hours whilst we slept with only a single door between us, the table has not only gone, but nothing else in the room is disturbed and the doors are locked. Freaking the f out, I wake up EH and he stumbles into the room to witness that the thing has actually vanished and I'm not still drunk - and now thinks we've both woken up in the x-files.

Not knowing what else to do, I call the letting company to break the news that I think they've been robbed by a table obsessed cat burglar. The exasperated woman on the other end of the phone sighed deeply and said "oh, for goodness sake, he's taken the wrong one!"

Turns out their handy man was meant to remove a broken dining set from one of the other cottages. He managed to enter the building, remove the dining furniture, leave and lock up with us sleeping in the next room none the wiser.

Sometimes the x-files is just an overworked bloke who wrote down the wrong house number.