I think there is often confusion between TP's and flight credits. The flight credits having the older style Amadeus 6 digit PNR reference, usually the same as the original booking (since it IS the original PNR mangled to force a credit with QF's tools hence all of the limits and stupidity). The TP, as said above, has a number beginning with 1081... (the 081 being the QF IATA number) and yes is basically like a CC.
Given QF has at least members details associated with TP's issued as credit (hence why I keep getting the spam emails about usage
) they do or should have a record of TP's linked to members accounts. In theory they shoul be able to show these on the account booking page like flight credits (sometimes) do... I mean I don't see why they can't do that, but that's a bit of programming for the WEK's to do.
Anyway QF should be able to locate them I should think. It's just the matter of getting through to someone who can actually do it...