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The form that uses that custom URL is still existing, I believe it is in your "Trash" folder. I presume it's one of the form titled "Expense".
You can do the following:
1. First, restore those forms.
2. Then open them in the form builder.
3. Open "Publish" wizard and check if they are using the same format in the custom URL. Click the "Reset" option to make that custom URL available again.
4. After that, you can delete and purge the forms you don't need.
I hope that helps.