I have one BTV note is fairly nice condition, crisp, sharp corners, only one center fold, but close to the end of the run. I think it was BTV0101something, and I have two other BTVs but lower numbers, in the 62000 range, but are only in VF condition. Are these notes going to be worth a lot in the future? I know it's a signature crossover note, but the condition isn't the greatest, so are they worth keeping, or spend?