I don't think the Source did anything on DOOM back then
I basically found out about DOOM on the internet. in 99 my homie had gave me his mixtape, and on there was KMD's "It Sounded Like a Roc". when I heard that, the memories came back to me about the shyt that went down with the Black b*stards album (which the Source did cover). the internet had just started popping around then with Napster, Audiogalaxy, etc., and I was thinking I might be able to find some version of the Black b*stards album there. doing some research, I found my homie had got that song from the Fondle Em KMD - Ruffs and Rares EP. I also found out that Zev was still around under the name MF DOOM. I listened to some snippets of his songs (Dead Bent & Gas Drawls) on Sandboxautomatic, and it was like an epiphany: I had to get this music (doing this research I also found SOHH).
turns out this is right when Operation Doomsday had released, and I saw a picture of that album cover. there was this little record shop by me that mostly had house music, with a little hip hop section, and I remembered I had seen that album there when I was browsing like a week before. I pretty much ran over there to cop (I also got Slum Village Vol 1 at that shop, so I think their little hip hop section was curated by someone really into underground hip hop), and the rest is history...
kind of a side note to Cage is he was working with Sub Roc when he died. I always wonder if that music is out there somewhere