Cisco 6509 help getting config

So I've got an old 6509 sitting around in the network acting as an aggregation switch for a number of "mission-critical" service, but it seems that the enable secret has been lost.

Fortunately, we've still got SNMP-write access to the device, so, ccCopy, right?

Unfortunately, I'm getting an error when running the script that the mib in question doesn't exist

Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: SNMPv2-SMI::enterprises.9.9.96.1.1.1.1.14.26

IOS version: s72033_rp-ADVIPSERVICESK9_WAN-M Version 12.2(33)SXI

Cisco's MIB navigator seems to say that this should be working.

I've also tried the legacy .1.3.6.1.4.1.9.2.1.55.172.25.1.1 OID, but that's not supposed to work in 12 and above, and doesn't.

Any ideas? I'm pretty sure at least one of the SNMP strings i've got is the RW string, but i really don't know how to tell any other way than this tftp file test.