Ok the big is gone. After each round, wallet announces if ecash has been found - for longer wallet histories, there is spent ecash first, that is filtered out. How far it goes until unspent is found depends on the history of the wallet being recovered. If nothing is found for 3-4 intervals it is safe to assume there is none.

Only two keysets matter for wallets not older then a year: current 001... and prev 005...

You need to be sure to use correct seed - e.g. if you reinstalled rotated to a new seed, that one will link only tge ecash issued from there on.