We were wondering if the Quantum Reflection technology can be applied to previously acquired CR cards - assuming that player hadn't already cashed them in for the rewards instead of keeping them for the VPs at the end? Could the CR cards collected be traded on for their bonus and points at any time?
The simple answer is no. As soon as you have researched QR you start to immediately gaining both benefits from resistance cards and discaring them. Cards previously acquired are subject to standard game rules.