What were their stats? Being a low level camper (high stats ofc) gives a significant amount of ip when attacking players of higher levels. If the lvl 38 had uncompetitive stats, then it's pretty convincing to me that they cheated since only one person on that team would actually be able to hit top 50 players successfully. As for the 3-min 100k ip feat, there isn't any proof that actually happened, so I'm a bit skeptical.