Since returning to bass playing in 2002 after a 17 year hiatus, I've only returned one bass. It was a boutique bass by a builder who no longer builds. It was purchased from a well-known and 'reputable' store in the USA. The photo on the website was of the bass when it was brand new. When I got it it had numerous minor scuffs and marks. I liked the bass enough that my plans were to keep it, in spite of it not being minty fresh as represented.
After closer inspection I noticed the neck was 'curved'. Not twisted, but curved. Imagine a long railroad car sitting on a curved section of track. Looking down from above the railroad car represents the bass strings, the tracks represent the neck. The neck curved underneath the strings. As I recall, on the treble side the G string was much closer to the edge of the fingerboard at the 10-12th fret than it was at the nut and 24th fret.
The day after receiving the bass I called the shop. The owner basically told me I was seeing things. I wasn't. I had to pay shipping back to the store (no surprise), plus he wanted to charge me a restocking fee. We argued over that, but he finally relented and agreed to refund the restocking fee. He told me that he would never do business with me again. I was several steps ahead of him on that sentiment.
I knew he would post the bass for sale as soon as he got it back. He did. Sadly, it eventually ended up with a Talkbass member. He sold it in the classifieds here. It caused a major falling out between the two TB members when the buyer discovered the same problem I had observed. This story makes me sad. I still think about how much that bass spoke to me in feel and tone.
M. M.