An object can appear with both salb and causative verbs, so merely finding an object is not sufficient.
ExampleMeaningProperty
نَزَّلْتُهُI caused him to descendTaʿdiyah
فَرَّحْتُهُI made him happyTaṣyīr
قَذَّيْتُ عَيْنَهُI removed grit from his eyeSalb
The diagnostic is whether the action is transferred, a new condition created, or an existing item removed.