This is a pre-coded sticker of the Treehouse Munzee. These were put in November's MunzPak and feature a Treehouse decal with the Treehouse code as well. Players are limited to one purchase per account, but this limit is outside of the normal Treehouse credit limits.
The Treehouse Munzee is a physical Destination Munzee that allows up to 6 POBs to land on it. This all new munzee fits into the Destination line of munzee types, but it also contains the ability to be captured once per player per 24 hour MHQ day just like Places Munzees! That’s right, the Treehouse Munzee means plenty of capping opportunities.
You can learn more about the Treehouse Munzee on the Munzee Blog!