That's a great suggestion! Like you, there will be records of how much I've spent there over the ~17 years, and on what specific items, by number, which would identify single band.
I only have 2 left, early lamplincs. I only think about them at Christmas as they get put away with the decorations at the end of the season and forgotten. They keep working with no weird behavior, and it looks like the $20 I'd get for them would not leave me much after shipping.