The Scrying spell states (emphasis mine):
On a failed save, the spell creates an invisible sensor within 10 feet of the target. You can see and hear through the sensor as if you were there. The sensor moves with the target, remaining within 10 feet of it for the duration. A creature that can see invisible objects sees the sensor as a luminous orb about the size of your fist.
Notably, this is all that the Scrying spell says about the sensor.
The Locate Object spell states (emphasis mine):
The spell can locate a specific object known to you, as long as you have seen it up close – within 30 feet – at least once. Alternatively, the spell can locate the nearest object of a particular kind, such as a certain kind of apparel, jewelry, furniture, tool, or weapon.
If my character has both the Locate Object and the Scrying spells (and thus knows what a Scrying sensor is), can they use the Locate Object spell to find a Scrying sensor?
This question asks what can be done with a Scrying sensor, and its top answer is interesting but largely extrapolates from the Clairvoyance spell. In this case, I would like to ignore the extrapolation, however, and assume that the Clairvoyance spell is a different case from the Scrying spell.
This question and its answers are a good start for deciding what can be targeted by this spell, but they do not clearly answer the case where the object's kind is something like "spell effect".