His QRZ says he doesn't use LotW, QRZ, etc. I just checked my QRZ log and came up with 0. I guess I had all of my contacts with him before I started using logging software. I found at least a few in my paper log, but didn't look too far. I know I've listened to him work pileups many times
The thing I like about my paper logs is I'd write down as much info as I could while I was trying to get through a pileup. So I have a lot of contacts in there that never happened. No time recorded is how I know I didn't make contact. So I can see when I tried to work people, and he shows up a few times.
Honestly I don't try and work those big guys often. I'm sure some people do everyday. I just do it once in a while.
50 years of hammering the airwaves. It's amazing to think of how many people he's spoken to, and how many people would know exactly who you mean when you said you worked Slavko.