Joining the fb group for your particular cruise can be very helpful and fun!
I was able to get a cabana at
Castaway Cay like this as people announced when they were dropping there's and made some friends before the trip that we met up with from different countries one night at the "club".
Also joining the fish extender groups are really fun. They have different ones like adults only, ornament, cooking recipes, etc.
I like to buy door magnets on Etsy to personalize our door as well. Of course buying all this stuff for everyone else means more packing!
Disney is not going to trash your stuff, I highly doubt that! The worse I can see happening is they would maybe ship it back to your house like they do with lost items
Since its a lot of stuff though I would imagine they'd contact you, so I suggest if you did that to make sure your luggage tags have your phone number and you have phone reception on your cruise!