MidAmeriCon II, the 2016 Worldcon, has made available to its members selected Hugo Award finalists in reading packets, so that members can be better-informed voters. See the 1941 Retrospective Hugo Awards voting page and the 2016 Hugo Award voting page. for the respective 1941 and 2016 Finalist Packets. In both cases, members will use their online voting information to access the Finalist Packets.
Hugo Finalists Packets are organized by the individual Worldcon committees, and obviously there is no requirement that a shortlisted work appear in the Packet. For questions about this year’s two sets of Finalist Packets, contact MidAmeriCon II. The Hugo Awards web site does not organize the Hugo Voter Packet or the voting on the Hugo Awards.
I just got a look at the Hugo voting pdf and I notice that the other two artists in the Fan Art category have more than three sample pieces of their work. I thought three pieces was the limit: was I mistaken?
Based on the debate at the time the three-item rule was adopted, there was no legislative intent to make three items a ceiling.