reivers /rievers were members of Borders clans bands who raided cattle and other livestock - Scottish version of rustlers?
I think the boundaries were quite flexible back in the day - were they called 'the debatable lands'? The Scottish border changed over the years, at one point it included land as far South as Newcastle is now? (I am sure I will be corrected by someone who knows better!)
My mother's clan was Eliot/Elliot/Eliott, well known as Borders rievers!

Wildlone - belatedly! - I would expect it was a bottle of whisky (not whiskey!)that was part of the arrangement!
(Whisky is Scottish, Whiskey is Irish or American)