Wes is right, they were identified (complete with pics) back on the old TUBFC ListBot E-mail list (circa 1997-2000) as older-style Australian miner boots. The story goes, one member was showing his family his Fett progress, when his grandfather (a miner from Australia, no less) ID'ed the boots.
I thought I had the picture saved, but it's been a long time since I've seen it.