@playnow254,
I gave up for the simple reason that I ran out of ideas. I may try again if I have a decent idea.
I went through the items on JN to see if there was an item that contained all of the letters and some others and that would be the answer. No luck, although a few of the items came somewhat close, like the great Mr Fuzzington the Warf You Can Groom! ™
I'm not sure that the mummy prize is relevant other than it being one of the words in the list. MUMMY could represent a Mummy, a Mommy, or simply the letters M-U-M-M-Y. I still feel the words could be related to Lost Desert.