17 Consecutive 2004 $20 Bills

Sorry to say this, but those are only worth the face value as of now. Maybe in 20-50 years might there actually be a return on them, but then inflation would have made just spending the bills more worthwhile.

The 2004 series is the new colored one with the Marin-Snow signatures right?

Also, if he wants to collect notes, maybe he can go to the bank and ask for straps of $1s or $2s. I've found many rare and uncommon notes by "roll hunting," especially a VF quality silver certificate from 1957