Oh Sherry, I am so sorry about what happened to Delilah. I agree with Lady's Daddy about the horrible people who would do that sort of thing.
Let me say, though, that you are a very strong and caring person to turn this into a positive situation for another homeless corgi. Hopefully you will be rewarded by having Delilah return as well . . . and then you will have DOUBLE the fun!
Microchipping may be something you want to consider for both the new guy and Delilah (WHEN she comes back . . . not IF). It's not foolproof, but will increase your chances, and it's not expensive at all!
Jackie and I are keeping our paws crossed for your reunion with Delilah. Be sure & post pics of your new boy & keep us up to date on his progress.