You can ask at the ticket office for a printout of your recent
journeys. I did this last week, for just rhe reason you mention. I
was given one with no problem, but I was told you can only get one
that covers the last 8 journeys.

Does anyone know how much of your journey history they actually keep?
Do they only retain the last 8 journeys, or can they trace everywhere
you've been since you got the card?