The MAC auth info will be in the local-userdb which you can export and then import into the locals.
In 6.3 the way that RAP whitelist was stored changed, and I can't work out how to do a bulk export. You can view the entries with
show whitelist-db rap
It seems like you need to add each rap entry individually with the command.
whitelist-db rap add mac-address aa:aa:aa:aa:aa:aa ap-group <group> ap-name <name>
In pre 6.3 it was relatively easy because the rap whitelist was in the local-userdb-ap.
If anyone knows a way to export the RAP whitelist in 6.3 and above, please advise.