If these pieces were on the shore for a while, it's normal that you won't find any barnacles on them. Walk on any beach that isn't regularly cleaned, you will f

If these pieces were on the shore for a while, it's normal that you won't find any barnacles on them. Walk on any beach that isn't regularly cleaned, you will find all kinds of marine garbage - pieces of plastic, rope, never any barnacles. They do look suspiciously clean - 2 years in salt water under the sun. But I have no idea how good airplane paint is in resisting to either.