Determining the true conservation status of a species, particularly those facing the threat of extinction, is a complex and ongoing challenge for scientists. While some species may appear to be genuinely extinct, with no confirmed sightings for an extended period, others might simply be elusive or inhabit remote and underexplored regions, making their detection difficult. To address this challenge, scientists employ various methods and criteria to assess the extinction risk of species.

1. Extensive Field Surveys: Field surveys and expeditions play a crucial role in determining the presence or absence of a species. Scientists conduct thorough investigations in the historical habitats and potential ranges of a species, covering different seasons and environmental conditions. If these surveys fail to yield any evidence of the species, it provides stronger evidence of its extinction.

2. Habitat Suitability Modeling: Scientists use ecological models and remote sensing data to assess the suitability of a species' historical and potential habitats. By considering factors such as climate, vegetation, and land use changes, they can identify areas where the species could potentially survive. If these areas show no signs of the species, it suggests a higher risk of extinction.

3. Interviews and Local Knowledge: Engaging with local communities, indigenous populations, and knowledgeable individuals who have historical insights into the presence of a species can provide valuable information. Traditional ecological knowledge can contribute to understanding species distributions and disappearance.

4. Population Viability Analysis: Scientists conduct population viability analyses to assess the long-term sustainability of a species based on factors such as population size, reproductive rates, mortality, and habitat quality. A low probability of population persistence over time indicates a higher extinction risk.

5. Conservation Status Categories: The International Union for Conservation of Nature (IUCN) has developed a set of conservation status categories to classify species based on their risk of extinction. These categories include "Extinct," "Extinct in the Wild," "Critically Endangered," "Endangered," "Vulnerable," and others. These categories are assigned based on a combination of the above-mentioned criteria and available evidence.

6. Reevaluation and Rediscovery: It is important to recognize that species previously considered extinct have sometimes been rediscovered. Advances in field techniques, improved accessibility to remote areas, and increased scientific research can lead to new discoveries or confirmation of a species' survival.

In conclusion, determining the true conservation status of endangered species involves a comprehensive approach that includes extensive field surveys, habitat assessments, local knowledge, population viability analyses, and regular reevaluation. The designation of "genuinely extinct" or "just not worth looking for" requires a rigorous process of scientific investigation and documentation. By continuously monitoring and studying species at risk, scientists strive to ensure the effective conservation and protection of our planet's biodiversity.