Define the feature precisely
Write down what you expect the feature to do. A powered seat is not the same thing as a seat with memory, and a parking display does not by itself describe every parking function. A precise question is easier to answer than a broad equipment label.
Check the wording and the vehicle
Look for a differently worded description, but do not force a match. Then inspect the relevant controls and ask the seller to demonstrate the function. A visible button may help identify what to investigate; it is not proof that the whole system is present and working.
Consider later changes without assuming them
Equipment may have been added, removed or replaced after production. If the seller says a feature was retrofitted, ask what was changed and whether there is installation documentation. Record that explanation separately from the original specification.
Leave the conclusion open when necessary
Use a note such as present but not demonstrated, described but not located, or awaiting clarification. Do not edit an equipment list to fill the gap with your own conclusion. If the feature is essential to your purchase, arrange an appropriate inspection before deciding. The aim is to resolve the practical question about the car, not to make every line of two documents appear to agree.