One of the theories on how the Asian Long Horn Beetle (an invasive insect that is also a wood boring bug) came to the US was in wood used in shipping. Either palettes (skids is the term I've heard), or wood bracing in shipping containers.
As a software engineer, I have only once in my lifetime delivered something for which I had a certificate that it was bug-free.
This was when the company was moving some work to be done in India. We shipped a lot of used servers there, and they were on wood pallets. Prior to shipping, the Indian customs required a paper called phytosanitary certificate for the pallets. It meant the pallets had no bugs.
Plastic doesn't seem so bad.