code: func (ks *KeyStore) Find(a accounts.Account) (accounts.Account, error) {
  	ks.cache.maybeReload()
  	ks.cache.mu.Lock()
  	a, err := ks.cache.find(a)
  	ks.cache.mu.Unlock()
  	return a, err
  }
docs: // Find resolves the given account into a unique entry in the keystore.