In What Other Universe...?

Walking towards the Museum at night, passing a Neighbour of mine who moved into Asgard fairly recently, I heard a little sound... and quite matter-of-factly said to myself, 'He has got fleas!'

In what other universe would you have a Neighbour like that???  It is a world that combines knowledge and learning in the area of Science, the Arts, World Cultures,  pursuit of the old-fashioned art of Correspondence, appreciation of a Ready Wit and then, what only can be defined as downright Silliness!  Ah, the glory of Animal Crossing!

Now for a question.  Kapp'n tells you:  'Most of your stuff will still be here when ye get back.  Yar har!'

What does that mean???  What could be missing?  I wonder if he is warning the player that special limited edition items might not be saved...