Yet more LNP Rorts, Greed and Corruption, page-248

The note would be written by his staff like all politicians.

I don't remember was Andrews favourite line, it got him off the hook for many things, like Hotel quarantine.

BO did not say I don't remember first he said he did not receive the bottle of wine, later when confronted with the thank you note he said I still can't remember the bottle of wine.
The bottle had not been added to the public register.

Most of this stuff is handled by staff so it depends on the competence of the staff.