^ From one of Ian's tweets:
"Just three serials is a bad joke.There are literally three tons of film cans and that's just from 2011. I have the actual proof"
It almost sounds like more arrive later, which could mean there wasn't time to catalog all of it. It could also mean that Ian only has evidence for the 3 tons in 2011 but thinks there could be more (but no evidence of it).
It's all pretty unclear but Ian thinks he has proof that 3 tons arrived in 2011. Those 3 tons are linked to the 90 episodes. Those would be fully cataloged by now even if they arrived Dec 31, 2011.