They are different reports. Say whether the sighting was occasional or a repeated pattern at your West Allis home. The room or entrance involved helps put the question in context.
Do I have to catch it?
No. Appearance can be described only as safely observed. Handling an unfamiliar spider is unnecessary. Mention other insects nearby if you’ve actually seen them, rather than assuming an explanation.
How do I decide about service?
Ask what the assessment covers and how a recommendation relates to the reported pattern. Discuss practical changes, preparation, and further checks. Understand the purpose of the proposed work before agreeing to it.