Welcome to the site mate and very good luck with your search. TBH you might have more chance of winning the lottery without putting any numbers on. The first problem I feel you have is seeking mint condition, basically unused original first edition rifles. People like myself who own these used excellent and mint condition venoms don't want to part with them as it is, so fear you finding boxed examples just not possible, but I'm happy to be proved wrong.
ATB.
Fozzy