Hi a few days ago I adopted two twin kittens/cats jut under a year old they were raised in a cattery at the rescue centre and never been in a house before. When I first got them home they adapted well, they hid for a couple of hours but came out to eat and use litter tray and afer a few more hours they were playing with toys I got them , especially liking the wand toys and after playing settled on the sofa next to me and all went great carrying on from that in the days that followed so much so I let them go into the passage and they bedroom last night. They happily played but when I woke up I couldn't find them and noticed there was a hole in floorboards undet my stairs and think they must have gone in their, I have left food and treats near hole to try encourasge them up. I'm really worried as they have collars on but. Not. Heard their bells. Do I need to call some one or will they come out when ready ?