who cares if the wrap might have been taken off? It doesn't affect the sound, just makes it look nicer
But not authentic. Not period correct. and bottom line: Not collector quality. Not collector quality means, not worth a lot.
My advice: If they're as great as you say, then keep them until you die and play them everyday. If you bought them for an investment, you should have bought and all original kit...
of Gretsch.
I love Slingerlands as much (if not more) than anybody on this forum. But those drums appear to have a suspect lineage. They may sound dark, woody, and warm like the best Slingys. But they don't have a pedegree. I'm sticking to $850 tops. However, I personally wouldn't go that high. No harm asking $3500-$4500. Just don't get your hopes up.
I also collect records. A $500 Beatles album is worthless without the cover. Cut the price in half if someone wrote their name across the label. Spindle trails or signs of use? Subtract $150. It's still a servicable record. But it's been defaced and collectors don't want it. It doesn't take much to bring a $500 record down to $10. That's why there are $500 copies - because most people don't have them. They're exceptionally rare. If you have to keep saying, "But..." this, and "but..." that to justify the asking price, you're too high. Drums are no different. The seller doesn't set the price. The market does.