Cant find imported photo file from flash card to Aperture.

As I have done at least 100 times before I imported over 60 raw photos from a Sandisk 16 GB Flash card to Aperture. I began working on the photos and exited and did say OK delete pics from card (even though that never works and I have to delete them in my camera later. I returned from a birthday party same day and imported those pics as well. But the 60 raw photos I had imported earlier were gone. Am in contact with Sandisk but want to know where to look on my Imac - OSX Yosemite v 10.10.5.

Disk Inventory shows I have 2,77.4 GB left of space.