I figured it out. I wasn’t sure which blk file held the transactions I needed and initially only loaded the last 50 or so blk files, when I did bitcoin -loadblock=blk03700.dat -loadblock=blk03701.dat … for the last 150 or so blk files it worked perfectly.

Took a little fiddling to make every file in a directory into a -loadblock=file argument on the command line. Linux probably has a dozen ways to do this in one step, but I did it in a multi step process.