As Rumble mentioned: you can fake it, by using a mob, but, technically, no you can't load an object inside another object, you can only load an object and then have a mob put it in the other object, the problem is that if the object is in the room, and not in the mobs inventory that the %at% trick he mentioned doesn't work - you can still hide the message though, it just requires a lengthier workaround (instead of using %at% 0, you transfer the players to room 0, put the object in the object, and then transfer all the players back to the room they were initially in).