The manual for Sea of Blood lists the following contents:
38 Prop Markers
1 Whirlpool/Cavern Entrance Marker
1 Large Shallow Water/Sand Bar Marker
6 Shallow Water/Sand Bar Markers
4 Shallow Water/Reef Markers
6 Tree/Shrub Markers
1 Cage/Pipe Organ Marker
4 Barrel/Statue Markers
5 Shark Fin Markers
5 Tentacle Markers
I found all but the Shallow Water/Reef markers. I have 2 of these, not 4, in a New In Shrink copy with intact punch boards. Was this a misprint, or am I somehow only missing 2 3-square-long pieces?
I'd try flipping over some pieces. You will see a different print on the back of some tiles.