The system automatically sends everyone who hasn't turned it off a "Similar to wish" email alert when another version of the book they're wishing for is posted. If none of those people requested your book, then most likely it's because they want a specific version of the book. They may be waiting for the audio book or large print.

Cathy nailed it. :-)  You can list your copy in the Book Bazaar discussion forum in the monthly thread for wish list books with alternate ISBNs.  The rules are at the beginning of the thread.  (Discussion forums are on the Community menu.)  And you can put a short "see also" tag on the wish listed book that refers people to your ISBN.

I have the same issue--brand new releases in a weird size, bigger than mmpb but shorter than trade sized, and the ISBN isn't listed here or Amazon:lol:

They were about $2 more than the mmpb size would be too.

From what i have read on the web thereare at least 7 types of book sizes in the USA but 3 are most common....

The traditional mass market paperback is usually 43/16 inches by 63/4 inches

the new premiums are 41/4 inches by 71/2 inches. Premium type size is slightly larger; words and lines are more loosely spaced for easier reading

Trade size paperbacks

My guess from your description is you have the new Premium size.