When my Dad was in a nursing home I purchased a nice robe for him. It disappeared. I talked to a neighbor who worked in a NH and she suggested that we think thru anything that we are going to leave there. Not only the problem of things disappearing but also how things are laundered. She suggested that when we want to replace clothing we purchase things at a thrift store because we then know that things have been washed a number of times and all fading and shrinkage has been done. Of course the price of a polo shirt is so little there that if something goes missing it isn't a big expense. He too would "shop" other rooms and it wasn't unusual to find a flowered pink slipper next to a green plaid one in his closet. One resident even had someone elses dentures on their dresser. Never buy or bring anything that is of value and of course as has been said mark everything you can as conspicuously as possible. The care he got was wonderful and everything else was just "stuff". Visit often and make sure the staff knows who you are. Visit at different times and don't announce a visit, just arrive.