Update:
I went to LV and they exchanged what I wanted exchanged (Montaigne GM Noir and Empreinte Leather Sarah Wallet) and even gave me store credit for the Montaigne GM exchange because the bag currently is priced at about $150 less than when I purchased it few years ago.
I received store credit for the Waikiki Cabas GM and the Ikat Neverful.
They did review my receipts and quickly examined the bags.
My SA was very nice - no issues. The Cabas Neverful was unused - he said I should keep it because it is going to be a rare bag in the future, but I'm in the process of getting rid of a bunch of bags from my collection and didn't want to keep it. Took about 30 minutes to complete paperwork and sign for the exchange & store credit.
Did you get the credit for the price you paid for for the Waikiki Cabas GM and the Ikat Neverful?