Found it!
The upcoming days were filled with an unending amount of irritation as Mira's group was forced to sift through all of the Fake Cores because they didn't know what the real one's appearance might look like nor could they tell the real from the fake.
To make matters even more annoying, Mira was the only one who could actually tell which one's were fake due to her Storage Space.
Mira tried wrapping her Qi around a bunch of the Fake Cores and transporting them to her Storage Space, but doing that exhausted her much too quickly that it was faster to grab them one by one or by doing just a few at a time.
When they first started this little project, Mira was constantly checking her Storage Space to see if they actually found the right one, but that didn't last for long.
After the first day, Mira stopped checking her Storage Space and would only look at it once every few hours. It was just faster this way.