Looking at the logs these are the last 8 that were spawned. Looking at it, there looks to be 2 different people doing the cycle on 2 different days. Looks like it spawns pretty quick at times. Looking back at posts from live 2000-2001, people are saying they didn't even see a spawn in 6 hrs at times.
I have seen posts saying its around a 35% chance at dropping. So Looking back, I see 9 drop out of 50 spawns.
Hope this information helps.
http://everquest.allakhazam.com/db/quest.html?quest=100
1 man_eating_creeper (83099) swampofnohope 2013-03-30 21:14:32
2 man_eating_creeper (83099) swampofnohope 2013-03-30 21:11:45
3 man_eating_creeper (83099) swampofnohope 2013-03-30 00:04:53
4 man_eating_creeper (83099) swampofnohope 2013-03-26 12:40:53
5 man_eating_creeper (83099) swampofnohope 2013-03-23 22:25:41
6 man_eating_creeper (83099) swampofnohope 2013-03-23 20:23:42
7 man_eating_creeper (83099) swampofnohope 2013-03-23 20:02:18
8 man_eating_creeper (83099) swampofnohope 2013-03-23 04:07:42