Download and use Find Any File to search for a file named "Library6.iPhoto". It's a file that is in very iPhoto library. FAF can search areas that Spotlight can't, like invisible folders, system folders and packages. If there's another library on your hard drive FAF will find it.
You can also try the following on the restored library:
Starting over from scratch with new library
Start over with a new library and import the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from your original library as follows:
1. Open the library package like this.
2. Launch iPhoto with the Option key held down and, when asked, select the option to create a new library.
3. Drag the subfolders of the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from the open iPhoto Library package into the open iPhoto window a few at a time.
This will create a new library with the same Events (but not necessarily the same Event names) as the original library but will not keep the metadata, albums, books slideshows and other projects.
Note: your current library will be left untouched for further attempts at a fix if so desired.
After getting the library back to where you want it go thru a coupld of Time Machine backups and then restore one of them (using the Keep Both option) and check the restored library to make sure it works as expected and has all of your photos. Then do the same maybe once a month just to make sure TM is working as advertised.