Disclosed are ethylene-vinyl acetate copolymer waxes comprising at least about 10%, by weight, of moieties derived from vinyl acetate, the copolymer having a polydispersity of at least about 6 and a molecular weight of from about 15,000 to about 40,000. In particular embodiments, the system is optimized for identifying the smallest available locker that would accommodate the parcel, and facilitating delivery of the parcel to that locker. The method further includes varying the pH level and temperature of the combination of the reactant and the unknown mixture to facilitate converting at least one selected component. , bipods and tripods, to a firearm in tandem.