[Zope] repairing zodb in 2.10.5

I'm running zope 2.10.5 on Macintosh OS X Leopard Server and I see that several objects seem to be corrupted, as evidenced by poskey errors and the fact that I can no longer access or delete them. I have found web sites suggesting that I use fsrecover.py, but I cannot find that in my Zope bin. How can I recover these individual objects? Thank you! B