not sure of your questions, but the "Rockin' the Lowlands" & "Hits the Lowlands" boots from Rotterdam is likely the source.
rip a sample and let's see
The problem is I can't play them. I have no Tape player anymore
I bought these short after the concert from the Dutch Flanclub.
Look at private mail
and for the Clarence fans out there get Garcia live vol13 whole concert with the Big man.