I used to feel the same way about gifts but recently have been having a clear out around home and selling on gumtree all the stuff that just sits there going unused like my mixmaster, breadmaker etc - they were wedding gifts.

Is there anything that you need/want that you can use the money you make selling the tupperware to help purchase? After my mum gave me a guilt trip for selling the chiminea she bought me for a wedding anniversary present that I've used about 3 times I told her that I was using the money to put towards a new dining table which is something we need and will use everyday.