Go to your Dashboard → Roasts → Discover.
Click Filters then
scroll to Green Weight and
enter 500 in both fields (or whatever weight range you want).
click Close
That should give you many potential roasts but of course not necessarily the best roasts for your needs. You can fine tune a bit with Bullet model (V1, V1.5, V2… you probably have a V2), roast degree (color).
In the preceding screen you can fine tune a bit more by entering (country) Origin of the beans. And Roast Name often includes specific bean ordering info which the originator uses to keep track of the roasts, e.g. try entering Mexico in Origin and Chiapas in Roast Name.