Can't find LR Catalog - can it be found in the cloud?

I just bought a new computer and downloaded Lightroom 5.1 to the new one. Everything is working fine; all my pics are there, my presets - everything´s working. I can edit my old pics and import new ones and edit them. I used the Migrant Assistant to transfer all my files from my old to my new computer, and I can find the Lightroom Library (.lrlibrary) on my new machine. My question is: do I need to move anything manually from the old to the new if everything already is working great on my new machine? Or can I go ahead and wipe the old computers hard drive without fear of losing valuable info? I've searched both computers for .lrcat to find the catalogue file but find nothing on either one of them (I only find .lrlibrary). Makes me wonder if the catalog is stored in the cloud, but I don't know how to find it there. Scared of wiping my old hard drive before I know for sure that I don't need anything on it.