Chances seem small that it was his, but chances also seem small of another quirky guy making tear-off $2 pads.
6 repeating digits is quite impressive: maybe you could call again and ask if he was in Chicago around a certain date.
Make your own with padding cement. Put the stack of bills in a vice and coat one edge a few times with the cement. I did this for a nephew as a unique gift. Some people being paid with these are suspicious.
Nowhere near as suspicious as the tire shop in east LA late at night on Sunday when I needed a flat patched, and I only had credit cards on me - and a uncut roll of $2s in the trunk.
I pulled that out to cut some off and pay and they all started screaming about feds and told me to get the hell out of there, no need to pay.
That would be quite interesting because when I was very young I crank called him after finding his number online. He collects phone numbers with repeating digits and mine has 6 repeated numbers. I guess he found my number peculiar and picked up! In my young and starstruck state I panicked and hung up. How coincidental to have potentially two obscure path crossings with the Woz.