Wireshark is great but it does not show you every byte the network carried. For example it never shows Ethernet preambles, only sometimes shows Ethernet frame checksums, and never shows interpacket gaps (which are a required part of the Ethernet protocol).
So yes it comes close but it just goes to show you, there is always more detail hiding somewhere!
So yes it comes close but it just goes to show you, there is always more detail hiding somewhere!