TheJediSonic
Official Terrarian
The Ocean Biome in 1.4, like a few other biomes, got it's own region exclusive crate drops. The crates in particular are named the Ocean Crate (pre-hardmode) and the Seaside Crate (hardmode). Coincidentally enough, Sonic Heroes' two starting stages (ignoring the tutorial) is Seaside Hill and Ocean Palace. Perhaps this might've been a subtle nod?