I think they were referring to the historical value of the bond itself makes it worth far more than its strict monetary value over time. So even if its 'worth'

I think they were referring to the historical value of the bond itself makes it worth far more than its strict monetary value over time. So even if its 'worth' 30-50 times more when you do the math, a collector maybe be willing to pay 500 time more due to its rarity.