"I know," I said. "It was around that time I was in it."
She looked at me and tilted her head to one side, as one would with a very old person. "Aah," she said. "Have you tried Abe Books?"
I can imagine her meeting her boyfriend in the pub after work. At some point in the evening, when the conversation really flags, she might say "do you know, I had this old bloke in this morning and he was trying to find a script to a play he was in in 1969. Can you imagine that?"