This is a bit like Oliver North when he was before the senate investigating committee and said that he had no recollection but that if documents could be provided to the contrary they might refresh his memory.
C'est un peu comme quand Oliver North a comparu devant le comité d'enquête sénatorial et a dit qu'il n'avait aucun souvenir, mais que si des documents prouvaient le contraire, la mémoire pourrait lui revenir.