From the description listed on the Openseas... "There are rumors that the poster contains a 'secret' that translates to a private key possibly holding a small amount of bitcoin, but I cannot deny or verify this."
This seems somewhat misleading, no?....
The P.P. of the first edition actually contains secret text promising a btc prize; this text was commissioned by a private party for a select number of copies of the initial run of posters, and the prize is presently unredeemable.