Re: a sealed box with no way of opening the bonnet and having a poke around ....
Bonnet is Scots, not English. 14th Centuryish.
Hood is Old English. Pre 12th Century.
Botnet is Usenet gobbledygook. Mid 1990s. (I'd give an exact date, but the gookids have fucked up the irreplaceable Deja News archive, thus losing this kind of trivia forever. Those who forget history ... )