Gw 8.02 HP3 on Nw 6.5 SP8

My GW system had some kind of problem (still determining cuase) but the
end result is that 3 USER DB are corrupt

I can see from the log that the POA started a rebuild but didn't
complete it - all that was left was a 50k user DB file

I have the DBA and DBB files that were created just prior to this but
copying them, over does not work

How can IO restore this DB ?