How does one actually claim a large lottery win?

In the case of an office pool, where several people are co-winners, how is the signing of the back of the tickets handled?

There’s no reason that can’t be done after the ticket is redeemed, and really, the longer the ticket is in your possession, the greater the possibility of it getting lost-damaged/stolen. The jackpot’s a lot safer in a bank account than it is in the form of a $1.4 billion dollar bill tucked into my wallet.