The team will now have to travel to play this season's bogey team - the Linton Cobras, with the winner going on to the grand final.
In April, Boxon were humbled at Linton Army Camp, losing 62-4, their first and worst defeat of the season.
In the return fixture on June 22 Boxon had the better of the first half before a 17-point buffer slipped away in the dying moments for them to lose 18-17.
Campbell said that however next weekend went, the club was proud of the team for making their first finals series after previously reaching their goal of just qualifying for the Premier league earlier in the season.