Hi DavidR ty for the heads up better answer than if avast removed them they have to be infected. But the files even if avast removed them are really still on the hard drive platters and can be recovered unless of course avast has a magic way to over write those sectors or kill the sectors on the platters. Which personally I can not see as even programs like kill disk after being used on a drive you can still get the files.
Read my reply again - Recovering them isn't really the issue, you can do nothing with files recovered from outside of the chest as they will be in an encrypted and renamed state, totally unusable.
We all know the file isn't truly gone but the entry in the file table, until that space (marked as free) is overwritten. The fact that it isn't gone isn't the issue here, but the ability or rather inability to use the file even if recovered.
Only if the files are Restored from within the avast chest (by the avast process) will they be decrypted and the original file name and location restore will they be usable (assuming that they aren't infected and avast doesn't alert again.