Blast from the past: Blocked progress as shards are split between multiple Sims

I started playing this in one save and it wouldn’t let me complete it in that one. So I had to then complete it in another save, but my other save had two shards. This save only has one now I don’t know how I’m supposed to complete it without all the shards. My other, Sim is also the one that met Emmett. So now I don’t know where I’m supposed to find him. I think I ruined the event for myself. Not sure what to do. Please help.

(I have seen comments mentioning buying more from the mail box but I do not have that option) 

Edit By Crinrict: Adjusted Title