[COLLECTION] Blast From the Past: Issues with specific Tasks

I've been doing the Blast from the Past quest lately and earlier I searched book cases for shards of time and found 3, however they did not appear in my sim's inventory and I have no idea where they are. Then my game crashed, and when it reloaded, I hadn't done any of those quests but it still registered them as being completed because my account completed them. My sim was living in San Myshuno and I moved her to a Willow Creek house and sold all of her furniture. Now my sim is ready to build the time machine, but I can't click on the shard of time to build it because the shard of time isn't in my inventory. Can I go back and get the shards of time again?