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Look for copies of physical distributions? The Internet Archive has ISOs from 1.5.2: https://archive.org/details/netbsd-1.5.2

Thanks for the advice, found a CD set on eBay for cheap. (The novelty of using CDs again after all this time is worth the price for me!)

Upload them online!

It looks to be the same set already on the Internet Archive but I'll upload them anyway in case there are any differences.