Explain finding missing photos by copying to another disk and back

I would appreciate if someone can explain what is happening to my iPhoto file under Lion.
Here are the sequence of events in my iPhoto library of about 5000 photos and about 44GB of data:
1. I noticed that several photos would not display when I clicked on the thumbnail. I got a black triangle indicating no photo present.
2. I found this to be a random occurence in many events.
3. I copied my iPhoto file to an external disk.
4. Then I used the rebuild database option with all options checked.
5. The resulting database was rebuilt with many problems. The missing files were still missing and most of the thumbnails had a different orientation than the base photo. The base photo was basicly correct and the thumbnal was randomly upside down or right or left.
6. I started correcting the thumbnails and after several hours I decided that I would never get through them and the problems with the original database weren't as bad.
7. So I chucked the rebuilt database into the trash.
8. And then copied the original database back from the eternal disk.
9. Then when I got into iPhoto all my photos were in the correct orientation and!!!!!! all of the missing photos were present again with their thumbnails. There were no problems in the database.
So what happened? WHy did this fix the problem? What I did was a straight finder system copy from one disk to the other and back.

I now have to decide wheter to use this new database or try to fix the old one.
There is no way to fix the old one. That databse file is unstable. It would be unwise to invest further effort in it.
My suggestion would be
a: restore from a known-good back up if you have one
Or
b: Stick with the rebuilt library and try recover the missing 69 pics from the damaged library and import them to the new one.
Regards
TD

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