It's a tricky problem to resolve because the solution will probably impact all players, and therefore players will still have less than others when all is said and done. Take this with a pinch of salt... but the way I see it; rite of the nine introduces 12 reprised weapons and these could be interacted with via these curios. It could be a weapon ornament, it could be focusing currency or something else involving these weapons (it's a short-term activity, so perk reroll??). It's possible that you'll only need 12 of them, and bungie may have already taken steps to ensure all players have more than they need. Another thought I had was it is a conversion item to redistribute armour stats I.e. switch out the 6 stat on existing gear to 3 stat gear, in keeping with the frontiers armour updates... this option would mean you'll only need 15 of them, as bungie may have (speculation) designed this to cater for each armour slot for each character. Who knows at this stage though... it could all just lead to Eris's dental floss!