If you know you posted the majority in a single thread (Clan or Replay thread) you Can view All Attachments in those threads.

as i have named All my replays with "!blub" in the beginning and posted All the good ones in a Clan thread i Can easily Access those.(even tho the Clan is Dead meanwhile)

The only other Thing i Can imagine is to search every Single post of the Account with the search Feature. But that requires toriprime.