If you've never bought from a local audio-stereo dealer before, and they are just getting to know you, developing a trust relationship can take time, maybe years.
"Try" is the word they'll run from on brand new higher $ furniture grade speakers.
"Buy" with a discussion around Return Policy may be a more acceptable approach.
And, if you do return them, be prepared to buy something else if you plan to come back to the store again. As a dealer I'd have some reservation letting people try stuff. Not until they become proven customers who buy from the store over time. At least a discussion around the dealer coming over and setting them up for/with you may open the door in a more mindful way.