Bought 2 sealed 20 rd boxes of Denver mint M2 ball at the local pawn shop at $5/box. It's taped at the top and bottom. The top corner is lose and the cartridge is stamped DEN 42. I'm not a cartridge collector, so is this a collector or just shoot it item?? I got a box and loose rounds of Lake City m1909 blanks Head stamp LC 72 the same time, same price. I appreciate a source to turn to! Thanks.