1) I attacked a SS convoy and when I finished plundering, it gave me 120k coins. If the SS convoy isn't available, it would've displayed a message saying this player had been already attacked, but it didn't.

2) My last plundering attempt was gone when I attacked a SS convoy, but then the enemy vanished when I teleported to konoha causing me to lose my attempt and rewards

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This is the first time this had happen and I've plundered many times before.