n0lasaints

I used my car this morning to bring my kids to school, after dropping off my son I returned outside to start up my is250 and nothing electrical worked. I tried jumping off the car and that didnt work and disconnected the battery and brought it to get tested and the results were good. It was suggested to check the main fuse and I went under the hood to check the main fuse (30amp) and thats where my road block came about, I opened the fuse panel and referred to the diagram and seek the fuse labled main 30a and nothing was there except a clear casing and metal brackets underneath. Can anyone help because i am unfamiliar this. (2007 is250)