Welcome to the ODK community, Andrew!
In ODK Aggregate, you cannot sort inbound forms based on search criteria. Given your security restrictions, your best bet is to use ODK Briefcase to download the data to your local machine, export to CSV, then open it in Libre Office and do what you'd like with the data there. If you are a little technical, you can automate this process using the command line interface. Alternatives for getting data out of ODK Aggregate are detailed in Data Transfer using Aggregate.
When you get a chance, please introduce yourself here. I'd also encourage you to add a real picture as your avatar because it helps build community!