I just spent a week in Nashville last month. Probably took 2 full days hitting up music shops, which was awesome, but Rumble Seat frustrated me as well
I ran across the same vintage Marshall stacks and inquired.
Asked for details on the orange Marshalls in the back corner - “Those belong to the owner, they’re actually not for sale.” Ah, got it. Checked out a side room with more Super Leads. Maybe one of these? Asked about those - “Oh, those are from the owners personal collection, they’re just for display.”
I couldn’t figure out what the hell was for sale and what wasn’t. The “display only” gear wasn’t marked that way, and it was just scattered all throughout the store. If you’re going to have unmarked “display only” gear, at least stick it all in one room for show so it’s easy to identify. I shouldn’t have to guess what is actually for sale. I got frustrated and left as well, haha.