I hate to play, "I can top that" but here goes!
Traded in my trusty old Bernina for a new, 730 a few yers ago. Also had to get a new sewing table with the hole special cut for the machine to drop down. I requested a Plexiglas insert so I could see to change the bobbin. What I got was a pretend wood insert and it had gotten scratched with pins as I sewed. After about a year I mentioned the owner of the store about not receiving the Plexiglas insert. He said that he gave it to me himself and it was the one I ordered. (Fortunately he is a good friend.) As I was leaving the store he casually asked me if I had taken the paper off the back....OMG, did I ever feel stupid... And yes, it had brown paper on the top that I had never thought about removing it because it looked like the same wood of the cabinet. Oh well, I can easily see to change the bobbin now through the clear Plexiglas insert!