I once read a tip about the best way to declutter your kitchen utensils. Stick them all in a box and when you use them, you can put them away where they go. After a month, get rid of the utensils that are still in the box.
The same idea works for tupperware. But you just put the lids on them and put a little piece of tape on them to seal them shut. When you use them, take the tape off and at the end of the month any that are still sealed shut can be removed from your kitchen.
Both really great ideas that I should have used BEFORE I moved all of this stuff 1000 miles away!